Cascade Crew

91camaro_rs · Posted: Sun Jun 13, 2010 11:37 am Post subject: tach resistors

ok so the 91-92 tachs had that wierd problem where they would always read wayyyyy off. i read about it on thirdgen a long time ago and in the post it said how much resitance to put on the microchip for the tach. well anyway i got it to work with the V6 a long time ago, but now i have the right amount of resistance for a V6 and i have a V8....so does anyone know the amount of resistance for a v8? cause i tried and i cant find that post on TGO

91camaro_rs · Posted: Sun Jun 13, 2010 11:39 am Post subject:

never mind i found it Embarassed

Dewey316 · Posted: Sun Jun 13, 2010 4:57 pm Post subject:

Err, its been a while since I did mine, I want to say it was like 196k ohms. Also remeber, if you are having the high reading tach problem, cut the pin off the chip used for the resistance, and wire in the correct resistance across the actual circuit, if you just add more restance until it reads right, as time goes by it will work its way off again.

91camaro_rs · Posted: Sun Jun 13, 2010 7:50 pm Post subject:

yeah i did the fix a few years ago ony using 280k ohm for the v6, and 196k is forthe v8

iansane · Posted: Sun Jun 13, 2010 10:42 pm Post subject:

Cliffs on resistor trick?

Dewey316 · Posted: Sun Jun 13, 2010 10:47 pm Post subject:

iansane · Posted: Sun Jun 13, 2010 10:49 pm Post subject:

Hrmm... interesting. My tach reads low. Embarassed

Dewey316 · Posted: Sun Jun 13, 2010 10:51 pm Post subject:

Mine read just a little high. Wink

aaron_sK · Posted: Sun Jun 13, 2010 10:55 pm Post subject:

You guys are funny. Laughing

iansane · Posted: Sun Jun 13, 2010 11:06 pm Post subject:

$.55 resistor + afternoon labor > $155 autometer tach and a few days of install. Very Happy

Dewey316 · Posted: Sun Jun 13, 2010 11:51 pm Post subject:

aaron_sK · Posted: Sun Jun 13, 2010 11:55 pm Post subject:

Hey now, what's wrong with a smooth Autometer dash install?

No need to have this kind of crap going on...

Dewey316 · Posted: Sun Jun 13, 2010 11:58 pm Post subject:

That is why we did the resister mod. On the 90-92 dash, you don't get the clean dash installs so easy. We have half-circle gauges, not the full circle style the early cars have.

aaron_sK · Posted: Mon Jun 14, 2010 12:02 am Post subject:

Before I sold the IROC I was planning on a 90-92 dash swap for it. There is basically the same amount of usable room in those dashes as there are in the older ones.

This is of course assuming that you have a totally new plate and all new gauges, and don't patch the new tach into the stock dash (like Travis' LT1 car).

*Edit: Found a pic I pulled from TGO way back when I hatched this scheme, and a pic of my old setup for reference. (And yes, I am aware that I single-handedly ruined this topic Razz

)

Alphius · Posted: Mon Jun 14, 2010 5:21 am Post subject:

Some of us like stock gauges. And they are reasonably accurate, too. $1 resistor fix is cheaper than $500+ for an Autometer install. I know I like the Autometers, but that $500 has always been hard to spend when I can use it to go faster instead. Razz

91RSVert · Posted: Mon Jun 14, 2010 5:44 am Post subject:

I'm glad someone posted this. Been wanting to fix that on my car.

Can someone post a link to a "how to" on here?

Dewey316 · Posted: Mon Jun 14, 2010 8:45 am Post subject:

91RSVert · Posted: Mon Jun 14, 2010 11:16 am Post subject:

I meant like a existing writeup on TGO, or some other board. Not that you had to take your car apart and snap pics.

91camaro_rs · Posted: Mon Jun 14, 2010 9:58 pm Post subject:

here is the link

http://www.thirdgen.org/techboard/electronics/357893-90-92-tachometer-fix.html

91RSVert · Posted: Tue Jun 15, 2010 4:14 am Post subject:

Thanks!