I am acquiring an 89 GXL tomarrow afternoon so that I may put my 88 base down for upgrades and general replacements. My simple question is this: Will a S4 TPS
(Throttle Position Sensor for those who dont know) fit and act like the S5 TPS?

 

The simple aswer is No.

88(S4) has a one potentiometer and the 89(S5) has two.
Different harness different computer different series.

 

Thanks for the heads up, I guess ill be in the market for one when i get tired of ding the heel toe all the time to keep her running at idle...