hey guys i have a ob2 ecu but just got it converted to OBD1 with the harness. car runs fine but the problem is my RPM tach in my cluster dont work but the Aftermarket (automter tach with shift light work).. what is the problem here?. any sugestion?

thanks in advance

 

do your turn signals work on car.... what i am getting to is if they dont work check your backup fuse under dash or its in the wiring

 

evrything work its just the RPM in my cluster dont work....... where can i find a wiring diagram for p28 ECU?