I have an 02 silverado that I need to hook upp an aftermarket tach with a shift light in. Do you guys know what wires I will need to tap into in order to get the tach to work?

 

This is really based on what aftermarket company you are using - you should really talk to them. But, according to Autometer web site, if that is what you are getting:

Tachometer Signal Wire Installation
for 5.3 engine(s)
White wire, pin # 10 of the red connector at the PCM. Set as 4 cylinder.

 

the tach is a faze slim line tach. It should still tie into the same wire on the PCM though correct?

 

you also can use the white wire behind the cluster.

 

Is it a big license plate size tach??

 

not to jack this thread but how does that work cause if you hook up a timming light it does some wierd stuff like on decell

 

5" with shift light but it is only 2" deep

 

It all depends on what signal the tach is expecting.