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Free advice from experience, cheap enough to do.

1) Replace oil pump with a Melling Hi-VOLUME (not pressure)

2) go with at least a 10/40 (I like Rotella 15/40)

3) Use a Napa Gold oil filter

4) consider changing the oil pump Input Shaft to a Mopar Perf. HARDENED Shaft.

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Thanks Hoof... that is what I was planning. I really don't think it's the oil pressure gage...but, I can get another one to validate.

Worse case - if it blows, I have a spare 400 in the garage