I installed the test kit gauge.
I did an engine purge procedure by the book.
I got pressure on the gauge in a few turns of the prop.
I completed the purge, checked the valve tappet clearance and buttoned up the engine.
Tomorrow will do a test start with the direct pressure gauge in place. Will do run up and leak check. The Mechanic will sign off the engine and a/c inspection if all goes well. I'll let you know