Last night I tore the dash out of the Jag for some major cleanup. I popped all the gouges and opened them up to clean the glass, the oil gauge had a milky white powder on the glass so that was one I really wanted to clean, after using minimal force to try and open the gauge I broke out the .99 cent strap wrench. unfortunately the bezel and glass had become welded together so I destroyed the gauge. Fortunately I had another one in the garage, after looking it over it looked basically the same except it had a different number on the back and one of the hookups were a different connector. After modifying the gauge connections I installed it but here is my problem. Now when I put the key in and turn it to the run position the gauge pegs out until the car is running, then it comes down to about where it used to run. Could I have hooked it up backwards? Or? Seems if I lost pressure now it would read 80+ instead of 0. HELP!!!!!