vn v6 temp problems

[91vn]

hi there. I have a 1991 vn wagon series 2 v6 manual and it has a problem with the temp gauge. i have installed a calais dash and everything is working great but today i was driving and the temp gauge dropped to nothing and the coolent light came on and hasnt turned off. i was just wondering if any one could tell me where the location of the temp sender unit is in the engine bay. could this be the problem or is it to do with the dash.; thanks

[WazzaVN]

I found that with both the calais i've owned sometimes the needles (speed, temp and fuel) get stuck at the bottom. if you find it happens again give the top of the dash a bit of a whack and they usally jump back up. I'm not too sure about what actually reads your engine temp though if that's the problem.