i installed my trans temp gauge today and did some of the wiring. i havent yet installed the sending unit but i may do that tomorrow. i have a srt pillar and i tapped the gauge into that wiring harness that runs up the side of the truck underneath the drivers side pillar. it says to tap into the ground, 12v constant, and the 12v switched. i did all three and ran the white wire down to where im going to tap the sending unit into the trans oil pan. my question is why wont the gauge turn off when i turn the truck off? it said somewhere in the instructions that the sending unit also acts as a type of secondary ground so would that be why? any info on this would be awesome.