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I have virgin early model A4 and have always had "mechanical" oil pressure gauge with connected copper tubing w/compression fittings. Gauge is on cockpit wall exposed to weather during the season. Am on my 3rd gauge in 42 years with same 3+ ft tubing [tee'd off to OPS]. Used Stewart- Warner gauges, sometimes a little hard to find "mechanical" type. FYI, engine is on slight aft tilt and have always used 4qt name brand 30W or 10-30W w/ 1 bottle of STP. Oil pressure is about 35psi at start up, 30+ psi at cruise and around 20psi at idle. Once in a great while I get a very small leak with this set up and a fitting needs a little tightening. I believe you get a accurate reading with the mechanical gauge vs electrical and matching the right sending unit.
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