Hello again....here's the new question, my temp guage has not been working since I bought the truck, a 1986 D-50 G63B....went to O'Reillys to pick up the 2 coolant sensors that thread into the intake manifold at the thermostat housing area...the single prong sensor which to my understanding relays coolant info to the gauge threaded right in no problem....the 2 prong sensor which I understand monitors the coolant temp would not thread in....at about 2 revolutions it stops and begins to distort the threads on the sensor. Went back to O'Reillys and they told me that sensor is the only one for my year truck with the 2.0 motor...so I ordered the sensor for the 2.6 just to see if that is the answer...does any have a suggestion as to why this would happen?...possibly a mid year part change? at this point O'Reillys has no other answer.