This may be of some interest to anyone that has a Rallye dash.

I was interested in the calibration of the oil pressure gauge in my '70 Barracuda so I checked it out & found what you see below.

Using an air regulator on the oil pressure sender I started at zero pressure & worked my way up as far as the compressor would go.

The gauge did not register at all at 17 psi then at 18 psi the needle went up to the mark as shown below, the needle wasn't stuck it did the same thing every time I tested it.

Winding up the regulator gave the pressures indicated below but I didn't have enough air pressure to get a reading for the top mark.

Gauges will vary but it gives an idea what pressure you are running.