The GM truck oil pressure gauge from 1973 - 1975 or 1976 makes a great replacement for the original clock in 2nd gen Camaros. You'll have to fabricate a mounting bracket, similar to that of the clock, but with a channel in the center to locate the gauge at the proper distance from the lens. You'll also have to trim the gauge face of the odd flange shape to get it to fit into the gauge cluster. The cool thing is that the gauge font matches the stock gauges, tach, and speedometer, other than the button covering the clock adjustment opening, it looks stock. I run a tee and use both the oil pressure sender to the light and a mechanical gauge. I've attached a shot of the '79 Dash.