Re: Restoring Rusty
Could you post pics of your x pipe set up. I'm interested in doing a similar set up but concerned with clearance/routing issues. Thanks in advanced.
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Re: Restoring Rusty - Operation Tachometer
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You may be interested to know... The basic damped air core movement is the same on all three small can gauges and for that matter the big fuel gauge. The parts that change are the bias resistor, bias resistor stud location, graphics, and faceplates. EXCEPT the 73-75 ammeter... The small and large fuel gauges use the same bias resistor on the same studs. You should be able to re-purpose one of the other gauges to fill the lower left hole using a set of gauge overlays and the correct bias resistor on the correct studs. It depends on whether you can find one of the three that has the correct mounting hole locations on the sheet metal face. 73-80 switch the sender through the dash switch. 81-91 use a motorized valve to switch the fuel flow. That valve has a switch to handle the gauge senders as well. |
Re: Restoring Rusty
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the new printer circuit board arrived today from LMC truck $84 bucks delivered ~ expensive if you ax me, but we like to try and do things right before going Comando, meaning I considered wiring things up directly minus the circuit board, but decided we would make that our Plan B
special thanks to US Postal Service for putting in that air vent hole in the box to ensure this electronic component is properly ventilated - LOL |
Re: Restoring Rusty
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and here they are side by side (ok top n bottom) for comparison, you get the idea
now keep in mind this is a comparison of the old '78 board and the new '78 board (my original '74 is still in the truck we will take a look at it later) |
Re: Restoring Rusty
They're performing black magic. Plating copper on plastic.
It's done with either metallic ink or vacuum deposition and a thermal laminator. Either way it's not easy and takes some pretty expensive specialized tools along with the skilled people to set em up. $84 is pretty good. How does the plate thickness at the contact connection points compare to the original GM part? |
Re: Restoring Rusty
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Re: Restoring Rusty
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dang it the local junk yards are having a 50% off sale yesterday and today but I'm not sure I'll be able to make it out there, sure could use a better radiator support
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Re: Restoring Rusty
Sweet jesus! Can ya pick me up a windshield?
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Re: Restoring Rusty
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Re: Restoring Rusty
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Still have a sale the other days :) |
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picked up a couple of these plastic storage bin organizer thingies from Harbor Freight, they are normally $14 bucks but I found a coupon for $6, now I gave up on Harbor Freight tools a while back but I figure they can't screw up plastic bins too much, LOL
now maybe you can relate, I struggle organizing car bits, like fuses, washers, butt connectors, light bulbs (why do they insist on selling us two when all we need is one) nuts and bolts, cotter pins, etc, it seems like every little thing needs their special nook to live in, so there you go also from time to time I just stand in the middle of my Temple (some call it a Garage others a Workshop) and I say why can't I find the altar, where did all this junk come from, where am I to rest by beer and I take a moment and I try once again to get re-reorganized |
Re: Restoring Rusty - Engine Bay Pics
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mounted the driver side inner fender today and figure I'll share a few most recent pictures (yes I said pictures and not pics, I speak 40+ year old, LOL) of the engine bay, with the inner fender and them purdy (for a while at least) long tube headers, oh and the painted frame rail
not back for a blond Pollack if I do say so myself, but we're not there yet... |
Re: Restoring Rusty - Engine Bay Comparison @ 8 months
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what's that? Show us the original how we got it out of the barn from the church lady, so we can Stare 'N' Compare
here we go... |
Re: Restoring Rusty
Wow, Greg, what a difference! Those inner fenders look great, considering the low-buck approach you took with them. Radiator core support next?
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Re: Restoring Rusty
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also please take my word for it that these pipes are fairly even and at the same height, it's these camera angles that make them look like Stevie Wonder did the install for me |
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A SUPER RARE SITE... a clean workbench! ~Approach with Caution ~ |
Re: Restoring Rusty
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Re: Restoring Rusty - Work Bench
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that's more like it...
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Re: Restoring Rusty
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and so operation Tach You're It commences
there are three things to carefully disconnect before removing the gauge cluster 1. disconnect the mechanical speedo cable (cable looks and feels like the brake cables on your old 10 speed bicycle) 2. disconnect the mechanical oil pressure gauge by unscrewing a metal tube from the back, first undo the three screws that hold the gauge and pull it forward a bit (why it's called mechanical I don't know, it should be called hydraulic) 3, disconnect the thin ribbon cable that goes to one of the light bulbs, it may be an additional ground strap |
Re: Restoring Rusty
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then we are left with some ugly cobra looking wiring harness
which for all intensive purposes we must study and learn, so here is the front side of the connector Pins #1 through #9 and their respected colored wires, we shall call this poor man wiring diagram side Uno |
Re: Restoring Rusty - Gauge Cluster Connection
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ok lets check out the other side, here are Pins #10 - #18
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Re: Restoring Rusty
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ok, so far so good, but here's where it gets interesting, I noticed that three wires loop from one side to the other, so wrap your mind around that for a minute
looks like the pink wire, the tan wire, and the tan/black wire are playing both sides (politicians are they) |
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ok folks put on your detective hats because we have a situation, there is a lonely loose black wire it disappears into the wiring harness and appears to be headed towards the cluster connector, we must track it down
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Re: Restoring Rusty
ok, it appears the black mystery wire splices into another black wire that plugs in to Pin # 9 ie Ground, fair enuff, now we need to figure out where it was headed the other direction does it go to the fuse box, or screw into the dash somewhere?
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Re: Restoring Rusty
Are those the black wires for your ammeter that run from under the hood? Run a test with your voltmeter to test.
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Re: Restoring Rusty - Oil Pressure Gauge Upgrade
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so one of the side perks of upgrading to a 1978 gauge cluster is that it has the electronic oil pressure gauge, so out with the old mechanical one first
the mechanical setup has a metal tube that runs from the back of the engine block under the distributor by the firewall and into the cab, and connects to the back of the mechanical oil pressure gauge, yes oil goes way up there into your dash and could possibly spray you in the face @ 60 PSI awesome - NOT! |
Re: Restoring Rusty
Maybe the black could be seat belts ?
Among everything else grounded they usually went down to one wire about a foot from the cluster plug in |
Re: Restoring Rusty
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alright so had to go out and buy an oil pressure sending unit, they come in two flavors cheap (ie $8.00) and the one I need ($36.00)
cheap = idiot light expensive = with a gauge Pretty much right off the bat I knew we were going to have a fitment issue, this thing is just too tall and bulky to fit under the HEI distributor, any of you wan to share pics of your electronic sending units? that would be much appreciated |
Re: Restoring Rusty
You need to get a 45 degree fitting with a 1/4 npt male to I think a 1/4 female of you have room behind the intake otherwise you will need a 1/4 nipple to 45 female/female.
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Re: Restoring Rusty
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yup i used an extender too
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Re: Restoring Rusty
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problem = solved thank you so much |
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time to compare the 1974 Mechanical Oil Gauge to the Electronic Oil Gauge circa 1978
note no wired plug into the mechanical one, just one hollow metal tube, on the other hand the electric one has three wires going to it the take away here is that the electronic gauge is only half the battle, it's useless by itself, you cant just wire it up and get results, it is the sending unit behind the scenes feeding it all the pertinent information, ie doing all the heavy lifting |
Re: Restoring Rusty - Oil Gauge Test
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next it was time to test the Electric Oil Pressure gauge
here's how I do it I set it on the battery and connect the negative stud (bottom most) to the negative battery terminal directly with a black wire with aligator clips on either end I connect the positive stud to the positive battery terminal directly with a red wire with aligator clips on either end Then I connect the third stud to the oil pressure sending unit directly I make these direct connections on purpose, this is to eliminate any wire harness problems such as shorts or broken connections, as well as any bad fuses, keep in mind this is a gauge test and a gauge test only, we are not testing the entire circuit here the goal is to keep it simple |
Re: Restoring Rusty - Tachometer Test
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I test the Tachometer in the same / similar way
put the Tach on the battery the Tach's blade terminals on the back are labeled, thank god, we have a positive, negative, and coil so we aligator clip positive to battery positive aligator clip negative to battery negative and [wait for it] connect the coil terminal to the left terminal on the HEI distributor I think it says Tach on it, the other one is Ignition or power something like that But I think we might could have a problem, I used my trusty (I love the darn thing) digital timing light to stare and compare the Tachometer reading to its reading, and I think we is a bit off, LOL |
Re: Restoring Rusty
A Take Away Lesson Learned so far people, and we all may appreciate this, it appears that it don't matter where the needle rests on the gauge when it is unplugged, like for example on them eBay pictures you are staring at going is that Tach jacked why is the needle resting on 15, or why is that oil pressure gauge needle in the middle of that gauge on this guys table at the swap meet, what I noticed is as soon as I send juice to it, by connecting the gauge to the battery, both positive and negative, the gauges 0 zero themselves out
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Re: Restoring Rusty
Does that gun do 8 cylinders? I only see 2 and 4 on the panel? Could be why its reading weird?
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Re: Restoring Rusty
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Re: Restoring Rusty
I thought 2 cycle and 2 stroke were the same thing.
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