67Dart273 said

The correct answer is -- you need to temporarily install a MECHANICAL test gauge. You can use your compression tester. You DO have one, right? If it's the type with a standard air quick coupler fitting, easy--just get a spare air coupler nipple, bush it down to 1/8" US pipe and hook in place of the current gauge/ sender. You should be able to build almost instant pressure on the starter

Mechanical fuel pump -- One thing that might be an issue is if the pump diaphragm has sprung a leak and is putting fuel INTO THE CRANKCASE. Smell the oil. Gas smell? LOOK at it: Thin? If there is ANY doubt, CHANGE the oil and filter

We need more details. You didn't bother to even tell us what sort of engine you have. Is this a Mopar /6? SB? BB? Chevy swap? Perkins diesel? Pratt 'n Whitney radial?

What kind of gauge? factory, aftermarket, mechanical or electric?

What kind of oil you using? What weight? How long since the last change?

What condition do you believe the engine is in? Miles? It use any oil? What kind of pump you running?

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