I got a gauge cluster from Raptor and when I put it in my car the Tach does not work. Is there something I have to do to get the tach to work? I heard they are different from 90 to 91 and up, I'm just trying to fing if there's something simple I can do or I will just switch the face.

I think the tach imputs are different on the 90's. I have one off a 90 if you need it. If so, PM me with offer.

No, I have the one from my car I was just wondering if there was a way I could use this one. I guess I'll just have to switch the face's.

Wait to see what someone else says. It may be something simple, I am not sure though. Why would you swap if yours was working fine?

you just need to switch the tach mechanics behind the face with your 90 tach. I had to do it with my european gauges, cause they were out of a 91+

It's pretty simple actually, just make sure you put the needle back on in the right spot.