mcnoople said

My memory from when I last added a mechanical guage to a slant(1999?) was that the oil pump outlet threads are 3/8" npt and most common pressure senders use 1/8" npt. I would not leave the electric sender off when installing a mechnical guage. How often would you look at the pressure guage? That bright red light is very useful for getting your attention and directing you to the guages. All it take to retain both is a simple hardware store pipe tee hanging off the end of the oil pump so that the sender and the mechnical guage hose can both be connected at once.

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TrailBeast said

I have done this before with a different car but added a buzzer in on the idiot light wire, temp, and voltage.
This way if I lost oil pressure the first and immediate warning was the annoying buzzer, and then I could see by the mechanical what was happening.
Same with the other two.
So on that car I had the idiot light with the buzzer and a mechanical guage for all three warnings. (Oil, temp, and alternator)
Daytime, if the light came on and I didn't see it the buzzer would go off for immediate warning.
It did kind of suck that all three buzzers would buzz from the time you turned the key on until the car was running, so I added switches so I could turn all the buzzers off till the car was running.

Overkilled the hell out of that huh?
It was something to do just for the fun of it. :D

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