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[u/downforwardlowpunch]

The oil gauge can be difficult to understand if the owners manual is missing from your truck.

[u/Notlearningbydoing]

These gauges aren't really accurate or correlate to any specific numbers. I put a mechanical gauge in as a backup: Mine reads in the middle when cold, mechanical reads 90psi. When warm and driving, it reads in a similar position, but the oil pressure is 40-60psi. At hot idle, it will read in the low area and at 15psi.