Thanks for the tip on the fuses to protect the ammeter purchase Ill be making. I have an American Autowire wiring harness kit that replaces the old stuff. I dont know if they have made any correction to the problem but I will look into it. I can give them a call.
As for the oil pressure line, I bought it from Classic Parts assuming it was what I needed
https://www.classicparts.com/1947-77...ctinfo/24-781/
Ill look around for the original I took off in the garage at least for a test hook up. I did take the fitting out of that plastic bag and it does thread into the gauge. If I can figure out what size thread fitting that is I can buy another fitting I guess that is a step down from the 1/4 inch air hose I have and connect it to the air hose and through the regulator for a test.