goofy tach - Third Generation F-Body Message Boards

livinforhim · 10-07-2009, 05:00 PM

Its a 3.1 v6 and the tachometer is significantly off. How do you adjust it? of do i have to replace another part on this car.

HCR13 · 10-07-2009, 06:55 PM

it could be the gauge itself. Do a search on tach repair...

NINÅ · 10-08-2009, 09:19 AM

Your problem is in the circuit inside the dash that moves the pointer.

It’s contained on a small plug-in PCB.

On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.

Use a 500K potentiometer.

Solder it across traces 4 & 10.

Move the potentiometer to half way.

Start the engine and compare the tach reading with a test equipment quality tach.

Dial it in, unsolder one side of the potentiometer, measure it and buy the matching resistor.

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Happy Racing!
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If People Drove Any Slower They’d Be Going Backwards

Fog lights are not driving lights. They look doofy. Turn em off slow pokes.

How bout those nervous nellies too scared to drive without headlights on in the daytime or if there is a little rain!

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