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IS the rule of thumb 10 per 1,000 in relation to RPMs? Just found that on an on-line search



Yes it is , though that is a little low for a fresh build , what pump do you have ?



then why have a tach ? does Your oil pressure gauge leap around like a tach ? Mine stays at 80 when cold....goes to 65 to 70 when warm....40 at idle....and if I juice the motor it doesn't react to a 10 psi increase for every 1000 rpm.....My is this pressure per rpm is rubbish