And keep in mind that the oil pressure relief is just that, the pressure that the oiling system relieves itself. ie, the maximum pressure...it your car has low oil pressure at hot idle, look elsewhere...except to clean the valve and be sure it's not stuck partially open....

+1 on Doug's idea, so long as you don't have a 60lb mechanical gage and a 140psi compressor....just sayin....

That is true as welll - hence the use of "also"... As the Queen said to Alice "The words mean what I mean them to mean - nothing more and nothing less..." (more or less....

I guess my mind was boggled by the concept of an adjustable sender....

Cheers, Ian

True, but that is adjusting the setting of the pressure relief valve, not the range of the oil pressure sending unit. 

In this case since the two gauges read differently, it is important to determine which oil pressure gauge is "more accurate" and make any oil pressure adjustments after that.

To some degree you can also adjust the oil pressure using either a custom made oil pressure relief valve or just the factory item adnd a few washers....

Cheers, Ian

If you have an air compressor, make an adapter for its hose to allow you to connect each of these pressure gauges to the air line. Compare the output reading from your compressor's regulator to each of the two oil pressure gauge readings.  Hopefully the air compressor's regulator gauge will be trustworthy and it will let you know which of the two oil pressure gauges can be trusted.

As for an adjustable oil pressure sending unit, no, there will not be such a thing.  That would be a device that would allow a user to effectively change the reading of a gauge to what they wanted instead of what was "correct".  The implications are that the gauge could never be trusted if an adjustable sending unit was fitted.  The adjustable oil pressure switches are an entirely different matter.  They allow a user to activate a warning light at a value of interest to them.

My original mechanical oil pressure gauge reads normal.  I'm installing a digital electric oil pressure gauge but the readings are considerably lower.   The manufacture is sending me a new gauge and sender.  My question though is, does anyone make an adjustable oil pressure sender?  I know they do for oil pressure lights but I don't think they would work for my application.

I'd appreciate anyone's input.

Thanks