That goes to the AutoMeter gauge in the Middle , and the AutoGauge on the left is back of the engine. I had my idle real low trying to get the lowest idle speed to capture the lowest pressure reading. (I had to blip the throttle to keep it from dying) For some odd reason, oil psi isn't going as low in idle like in the previous videos. Take note that the AutoGauge on the left reads consistently a little lower pressure on all my videos.
I don't think anybody has mentioned it but is that little plug that's down there underneath the pressure sending unit approximately 7 and 1/2 in down or about 2 and 1/2 inch up from the bottom of the block missing. You know the one that doesn't affect oil pressure according to many experts.