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Thank you all for your guidance and suggestions. Napa $13 oil pressure switch did it. Replaced it and motored about yesterday. Miles away at home now so do not have the napa PN.

Oil Pressure Switch 037323

As suggested took off front wood work and could finally see the leak. Oil sensor, which yard says can probably found at napa.

Thanks Tom, Yes the dipstick was clean. Had major oil cleanup under engine & bilge. Thanks for the tip on the scope. Good idea. What is also odd is that the tach is not working for the first time since I've owned the boat. Not sure it's related, but seems to be. Not sure of the tach wiring and it's engine access, if any.

Thank you KWKloeber, Correct. The panel does not have an oil pressure gauge. When the hose went on your M-25 was access to the hose an issue? I'm wondering if I have to cut through the bathroom wall even to get at the area of the oil leak.

While leaving the marina last weekend with our 1998 C34 the oil low pressure alarm came on and we stopped the engine and when the dip stick was checked it was clean. Coincidentally, the tach was not working either for first time since I've owned boat (3+ years). When back at the slip added more oil so that where the leak was coming from could be found. Leak is coming from the nearly inaccessible port side of the M35B engine up against the head (bathroom) wall. Because it was so hard to get at, could not absolutely determine where the oil leak was coming from, but it's in the area of the oil sending unit.

The oil filter was on snug and not leaking. The dip stick was not leaking. The oil drain cap was on.

Has anybody else had a similar issue? If so, how did you gain access to determine where the oil leak was coming from and how did you gain access to fix the problem? Did you have to cut access through the bathroom wall?