Lou: You should also check the WOT voltage. It is possible to go too far with this mod. Never exceed .475 vdc at WOT. Personally, I don't like using the "piercing" method. It allows corrosion where the insulation has been pierced-bad news where road salt is used in winter. Easy enough to make up a jumper set and wire the voltmeter in series with the TPS signal wire. Pick up the ground at the battery.
