Speedhut speedo wiring

[69SCSS]

Hey guys, I put a new set of gauges in my truck, and I'm having a weird issue with the speedo, and I wanted to double check the wiring. I have a 700R4 with VSS, with a black / purple wiring pigtail. Here is how I have it wired:

Purple - signal to speedo
Black - Ground to speedo

I am assuming from the pigtail that purple is the "high" side, and black is the "low" side. The speedhut wiring says to use the signal for the white lead and ground from the sender (or chassis ground) for the black.

Why am I asking? Because right now the speedo does this: https://drive.google.com/folderview?...EE&usp=sharing

As you can see, the speedo is working OK, but the odometer is rolling about a mile every second. Over about 50mph the needle bounces like crazy. I have calibrated it a few times now, and no change. I am assuming the gauge is bad, I just want to make sure the wiring part is correct. I've been talking with Speedhut since thursday about this.

Anyone wire up a Speedhut speedo?

[panhandler62]

If you had the wires backwards I suspect it just wouldn't work at all. The odometer being uncoupled from the speedometer (odometer indicating speeds of like 700 mph while the spedo is mostly normal) sounds like a faulty gauge to me.

[69SCSS]

Originally Posted by panhandler62

If you had the wires backwards I suspect it just wouldn't work at all. The odometer being uncoupled from the speedometer (odometer indicating speeds of like 700 mph while the spedo is mostly normal) sounds like a faulty gauge to me.

Me too. They said it is signal interference, but I don't think that would seperate the odometer and speedo. That seems really unlikely, but they should know their gauges. I'll try the filter they are sending me and see if it helps. From what they said my wiring is correct.

[Andy4639]

I used the GPS speedometer. I have all their gauges installed and have had to call them a few times with questions. I like the gauges and all but they seem to be very touchy!

[69SCSS]

Yea I noticed! Actually all the gauges work great EXCEPT the speedo!

So I installed the filter like they said, and now the gauge does very little. After a bit it did swing back and forth a few times, peg out at 120mph, swing back and forth and then go right back to 0. Wouldn't even let me do the calibration, just went back to the odometer after 5 seconds!

Yea, I think there might be something wrong with the gauge. But they look really good!!!

[Andy4639]

Nice set up! Here is mine. I wired mine and made pigtails from the dash to the main harness and just unplug it when I need to seperate it. Do you have the little voltage box in the wiring they send you? I wished they used heavier wires in their stuff but I guess it's ok.