checking fuel preasure

Easiest way we found was to put a pressure gauge inline at the fuel filter. If you don't have access to a pressure test set made to do this try borrowing one from a garage if you know someone. Our 89 had 5-12 psi old pump (1 year old) with a new pump it sits at about 16 psi... Our 92 was low and we found the spring was broke in the regulator.

Is the 89 throttle body injection?

Al

Yes, our 89 and 92 are