Hmmm interesting question , being honest i don't know the exact answer . However 25-65 psi is generally seen as acceptable , though many manufacturers state that an engine should read around 30 at idle , rising to 60 when running at higher speeds .
My mothers mini has a factory pressure gauge fitted (98 Rover Mini) , that reads 60 psi at start up , falling back to 30-35 at idle as the engine warms . Poking the engine with a stick does raise that , but nowhere near the the top end stated .
Yet interestingly the pressure given for my x230 are 11.5 at idle , rising to 56 psi at 3800 rpm ? .
Personally i would add both via a tee bar , and maintain the pressure switch in the circuit , for that sort of belt and braces touch !
same problem 2021 ducato 140 low oil pressure warning when left over night about 4 months ago then done it again 3days a go my truck done 170,000miles engine sounds good spoke to this guy 07508402985
