Old style tach - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Wootdog · 12-07-2003, 06:58 PM

Got the in dash tach with a red or pink wire and a brown wire. I have a newer computer setup. Only one wire. I would think that I would hook the computer wire up to the red/pink wire and hook the brown one to ground. And in the painless wiring setup that I have there is only one wire also. Don't want to short the tach out. Any suggestions from those that have put the big truck tach in? Wootdog

Rod · 12-07-2003, 07:17 PM

Originally the tach was grounded by it being in the metal dash cluster.. the red went to fuse box for power and the brown went to the coil negative side. I'm not sure where you would hook up wires for a computer application.

JimKshortstep4x4 · 12-07-2003, 08:21 PM

Like Rod mentioned, the red, (pink) wire is for power, (switched ignition), the brown wire is for a tach hookup. Not sure what you have but on the HEI's there is a terminal for the tach and the brown wire hooks to that.

Does your computerized ignition have a terminal marked "tach"?

Jim

Wootdog · 12-07-2003, 08:33 PM

So red for power and brown to the computer. I would have thought the red wire on the connector would have been attached to the foil run. Thanks guys, Wootdog

Gene · 12-07-2003, 10:27 PM

Not sure what you mean by computer, but the brown wire HAS to go to the distributor.

Wootdog · 12-07-2003, 11:59 PM

This has a computer and the distributor connects to the computer. This is not like an hei. Wootdog

rusty ol' 69' · 12-08-2003, 02:46 AM

Then your fu(ked dude.

Naw, do you mean you have a distributorless vehicle or you have the modern style electronic box (Can't remember the word for that computer thingy either) controling your ignition, fuel, etc. If it is an electronically controled ignition you should still have a way to splice into the wire or have an extra terminal for the tach. Sounds like you need to have it professionally installed though.

Wootdog · 12-08-2003, 08:56 AM

there is a tach wire that comes out of the computer. The distributor feeds the computer.

12-07-2003, 06:58 PM	#1
Wootdog Senior Member Join Date: Jan 2001 Location: Virginia Beach, Va, USA Posts: 1,672	Old style tach Got the in dash tach with a red or pink wire and a brown wire. I have a newer computer setup. Only one wire. I would think that I would hook the computer wire up to the red/pink wire and hook the brown one to ground. And in the painless wiring setup that I have there is only one wire also. Don't want to short the tach out. Any suggestions from those that have put the big truck tach in? Wootdog __________________ 1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT

12-07-2003, 07:17 PM	#2
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Originally the tach was grounded by it being in the metal dash cluster.. the red went to fuse box for power and the brown went to the coil negative side. I'm not sure where you would hook up wires for a computer application. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

12-07-2003, 08:33 PM	#4
Wootdog Senior Member Join Date: Jan 2001 Location: Virginia Beach, Va, USA Posts: 1,672	OK So red for power and brown to the computer. I would have thought the red wire on the connector would have been attached to the foil run. Thanks guys, Wootdog __________________ 1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT

12-07-2003, 10:27 PM	#5
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Not sure what you mean by computer, but the brown wire HAS to go to the distributor. __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

12-07-2003, 11:59 PM	#6
Wootdog Senior Member Join Date: Jan 2001 Location: Virginia Beach, Va, USA Posts: 1,672	negative This has a computer and the distributor connects to the computer. This is not like an hei. Wootdog __________________ 1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT

12-07-2003, 08:21 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Like Rod mentioned, the red, (pink) wire is for power, (switched ignition), the brown wire is for a tach hookup. Not sure what you have but on the HEI's there is a terminal for the tach and the brown wire hooks to that. Does your computerized ignition have a terminal marked "tach"? Jim

12-08-2003, 02:46 AM	#7
rusty ol' 69' Grubbin' Join Date: Aug 2002 Location: Chico, CA Posts: 293	Then your fu(ked dude. Naw, do you mean you have a distributorless vehicle or you have the modern style electronic box (Can't remember the word for that computer thingy either) controling your ignition, fuel, etc. If it is an electronically controled ignition you should still have a way to splice into the wire or have an extra terminal for the tach. Sounds like you need to have it professionally installed though. __________________ project rust attack 1969 Chevrolet LWB w/ 307. I got power steering now woohooooo!!!!!!!

12-08-2003, 08:56 AM	#8
Wootdog Senior Member Join Date: Jan 2001 Location: Virginia Beach, Va, USA Posts: 1,672	tach wire there is a tach wire that comes out of the computer. The distributor feeds the computer. __________________ 1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT



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