I need Help with a problem I have my wiring was fried in my 89 so i used all the the wiring and computer from a 91 both have 305 tbi the 91 was auto with the electric speedo the 89 is manual 5 speed how can i make my elctric speedo work

 

I'm unsure I understand. Did you swap the 91 dash into your 89?

JamesC

 

yes complete change from the 89 to the 91

 

Then you need the electronic VSS from a 90-92 T-5.

JamesC