I just ordered the radio panel that holds three 2 1/16th gauges for my GT. I know for sure I am going to put in a mechanical oil psi and mechanical temp gauge. Any suggestions on another usefull gauge for the other spot?? I was thinking the of putting in a voltage gauge, but I don't run any stereo equipment or electric fans, so if there is a gauge I could get more use out of I would go that way.

It kinda sounds like a voltmeter would be cool though. Uh oh, you need to find a place for more gauges.