I have a 1995 Jetta glx (manual trans)... in the morning when i start my car up the spedo and tach come to life with no problem. The problem is if i turn the car off after it has warmed up, now both gauges stay at zero and dont budge. This happens if it is hot outside and my car has been sitting in the hot parking lot all day too. please help!!! I dont know why the temperature seems to be affecting this issue.