jmahle67

help guys my tachometer is not working at all. its a 94 gt. It hasnt worked since I got the car. wanna get this fixed

mattdel

Try this:

Waferboy

If you get through the tests above and find you need a new tach, you may want to look over the write up I posted about a tach fix I did on my '93. My tach wasn't dead but it may has well of been. Good Luck!

https://mustangforums.com/forum/5-0l...ml#post8018880

jmahle67

thanks for the replies will check when i get home from school

mebirkle

Hi, do the instructions above work for a 90 LX? My tach is pointing straight down when I start the motor? Thanks!

jmahle67

hey all wanna bring back this thread, I tried running a jumper from the tan/yellow behind the instrument cluster to the ignition coil and got nothing. I assume the tach gets its signal from the computer right? what wire goes to the computer?

mattdel

The tach gets it's signal from the negative wire of the coil. That same wire, however, splices out towards the computer as well, and has a resistor in-line that correctly calibrates the wire for 8 cyl RPM readouts. Bottom right of this image:

jmahle67

so is it possible the resistor has gone bad and i just need to replace that?

mattdel

Yes, that is a possibility.

jmahle67

just wanted to update this thread, i got the tach working. I swapped out the actual tach part inside the instrument cluster with another one. its out of a 96. Its probly a few hundred rpm off but its good enough for now.