I got a set of 89 gauges with the tach and 120 speedo. I was wondering if it would work in my 91 that doesnt have a tach and it only got a 85 speedo. i know the tack wont work but i was wondering if the speedo and the gas and other stuff would work.

 

It might, I would suggest try to look at the wiring diagrams we got in the FAQ see if it is wired up the same.