tacho ta22

[gargoyleman]

how can i test to see why my tacho is not working i have a spare tacho what wires should i check on coil or alternator i just want to be able to test without taking dash out i know my spare works and old one worked before i painted the face white pls any ideas will be appreciated

[merc-blue]

just run it off the coil pulse

[celica_john]

running your other tacho off the coil won't tell you why the factory one isn't working.
Is it the stock engine? check the wiring behind the instrument cluster.

[merc-blue]

oh sorry i thought he wanted to check the accuracy,
you sorry mate that instrument cluster is coming out

[w810sc]

Before you start, check on your coil that there is a wire connected to the negative of the coil. This is the wire that connects up to your dash's tachometer.
fonzy