Yes, just use the Sunpro/Bosch unit. Correct the readings to be closer to actual by using "roadtrip's" correction curve with a resistor of your choice in line. I used a 22 ohm resister to get close the reading for cruise rpm of about 3000 rpm, this for a 164.
"roadtrip's" work was very good. He always had some interesting and useful analyses and techniques. Wish he still contributed to the BB. Sorry he left.
Looks lke an interesting mod. My own feeling is that the pressure reading is of interest at two points, hot idle and hot cruise, ie, ~800 rpm, and ~3000 rpm, and if the reading is decent at hot idle, ie, >~5-10 psi maybe, even if it is not accurate, it's basically going to be better at hot cruise rpm, even if not close.
It's in. I did it on a hot engine. 25 PSI idle and about 70 PSI when revved.
I have to take a short trip later this evening. I'll let ya know after that.
FWIW, I did test the oil pressure with a mechanical gauge a year or so ago, and got 76 PSI when revved.....