Well I finially got my 91 and up cluster to install into my 90 240sx w/ SR. I just tried swapping just the tach out from the 91 and up cluster and put in my 90 cluster. Plugged everything in and no RPM's and now my gas light is on and the needle goes completely to the top. So can anyone help me out. Did I do something wrong? I was told just to swap the tachs out and that's what I did. Any help would be appreciated.

I just ended up having the plugs reversed. Everything is working fine. Mods can delete this post if needed

 

ok