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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
15psi seems to low to me. My v10 is about 30-40psi warm idle. Did you check the screws for the oil pump cover? They are known to back out and cause loss of oil pressure, even seized a few that dropped to 0psi while driving. The oil pump is built as part of the timing cover and the screws for the pump cover are on the back side. Quick peace of mind to just locktite them in, I did on mine when I did my cam and head work.
Are you using a mechanical gauge? I have had v10s apart and always lock tight the pump screws in on reassembly. I didn’t disassemble this engine before installing it so this could be an issue. The factory spec says 12 to 25? For now I will just keep an eye on it and if I see it start dropping lower than spec I will pull the front clover and check. Thanks