Planetman Said: "I would suspect the oil pump or oil pump seals 1st."

The square O-Rings are notorious for blowing out on a cold start particularly if the oil is too thick or the temperature is low.

Typical symptoms are lightly glowing oil pressure light at idle + it goes away when rpms are increased. If the cam sprayer had been left out, the front conrod bearings would have died & spun first & the first cam bearing would be dead.

I use a regular O-Ring behind the square O-ring at both ends, it halves the amount the oil pipe wobbles & prevents the square O-ring from leaving. Been doing this since since 1987.

1st, you could borrow a mechanical gauge to ensure the pressure is low as I have had an oil pressure light sender fail.