how do I install a new water temp gauge in my 89 IROC convert

 

The gauge is pretty simple, take out the 8 screws that hold the black plastic bezel on the cluster, then remove the screws around the perimeter that hold the clear cover over the gauges. once that's done, you'll see the screws that hold in the three center gauges. Take those out, and the gauges just pull out directly toward you. The Speedomoter is the only one that can't be removed this way, because of the cable, and I think there are also screws holding the speedo on from the back. The tach/oil press, fuel, temp and batt can all pull just out from the front.