do i have to change this harness??
 

ok im putting a 89 7mgte motor in my 87 n/a....do i change only the engine harness or do i rip the whole harness from the dash?and will the auto ecu work when i have the motor on a 5 spd?

If the colors on the harness match the plugs on the ECU then you dont have to change them. And the auto ecu will work on a 5 speed.

thnx man vurrrrry helpful