[tailwind22]

I've tapped the braintrust over on Rennlist 964 forum as it is a bit more active than the Pelican 964 forum. Thought I would try here. My car is a 90 964. PO had the motor rebuilt 3000 miles ago and I strong oil pressure and performance. I started a header and exhaust install and discover several of the oil circulating lines were weeping. So I drained the oil and replaced all lines that circulate oil including the oil cooler lines. Not a fun process but got it done. Put about 10 quarts in the system since everything was dry. Pulled the lower spark plugs and fuses for the DME and fuel pump and started repeated cranking runs. increasing up to 30 seconds continuous and resting starter. No pressure was indicated at the oil pressure gauge (which had been behaving well). Here are the following steps after that:
-pulled oil filter to verify oil had moved from the oil tank to the motor and back up
to the filter ( was about half full of oil)
-removed the base holding the oil pressure sender and verified an oil level at the
opening about 3/4" below
-hooked up mechanical gauge and went through the cranking process again. No
pressure just some very slight movement of the gauge needle.
-installed a fresh sending unit (Porsche Genuine) so I wouldn't have to go back
there again. More cranking, same result.
I have not checked the oil pressure relief or safety valves but all was working fine previously.

I'm out of plays and am asking the braintrust for ideas on next steps.