Ok, let me get this straight, no power to 87A when brakes applied which goes to pin A, Optional switch provides ground if towing in 3rd switch N.O., Ground provided to lighted switch when convertor locks up in fourth from internal ground/case? Also I'm running the Edelbrock 1406 Performer carb with a Lokar TV cable and bracket. I set the TV cable to full open at WOT at idle cable has slight tension roughly 3/8" from cable housing. Does this sound correct or has anyone run this set up? I did notice Bowtie Overdrives offer a different spring for the plunger at valve body and an adaptor for the throttle arm for the TV cable? Does all this need to be installed or will current configuration work? Thanks G