90 motor in a 91... tach wont work!

[ihatedsms]

i put my 90 motor in my 91, and swapped in a 91 coil pack, transistor, throttlebody, and cas.. and i am still using my 90 ecu, and i did 2 pin swap.....

so my question is.... how do i make my tach work?

 

[ihatedsms]

and i fergot to mention
it has a 90 guage cluster in it too, if that has anything to do with it

 

[DSM90AWD]

The 1990 Tach needs a signal from the 1990 coilpack. The 1991 Tach feeds off the transistor.

Check out this VFAQ .

 

[Mike1992]

Swap in a 91-94 gauge cluster and I garantee you'll have a working tach again.

 

[ihatedsms]

ok awsome.. thankss, ill have to find one, cause when i got the 91 it didnt have a guage cluster thats why i put my 90 cluster in..