Dave Leonard tells me his VDO pressure sensors are
not living more than 20 hours so he is replacing
them with a mechanical oil pressure gage.
Needless to say the oil pressure is critical to the
life of the engine as well as Tracy's gear box.

These are AN -3 brake lines but they will work as a reliable
and robust oil pressure gage connections for  a MC Master
1.5 inch OD oil pressure gage. Yes one and a half inch
outside diameter oil pressure gage.

https://www.pegasusautoracing.com/productselection.asp?Product=3

You will need a jic steel NPT 1/8th pipe adapter to the
gage and to the -4 an line.

We are not happy with the automotive oil pressure gage
and it's nylon lines that are in there now.

Paul Lamar