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With this comment, I assume that the filter on a 964 is in the scavenge circuit (I'm more familiar with earlier models) ... seeing oil at the filter wouldn't be relevant to oil pressure on your gauge (which measures the pressure circuit), so don't base anything on that.
A couple thoughts:
So you've only cranked and not tried to start? You mention seeing a tick on the mechanical pressure gauge. Did you get that on the cockpit gauge too? Ideally I'd like to see 10 psi or something, but you may not see that just cranking on the starter, even with the plugs out.
If you've got oil at the sender (or just below), then clearly oil has gotten where it needs to be. If you want to be more sure, crack the sender or another fitting loose and see if oil comes out when cranking. If it does, I'd tighten it back up and give a try starting. Obviously make sure you get oil pressure immediately upon startup, or shut it down.
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