My experience has been that when a gauge is working well and then there is suddenly no oil pressure, the problem usually is not the gauge, even though I want it to be...
If you have an engine that has not been rebuilt in the last 30+ years you might have pieces of the old nylon timing gear plugging the oil pump pickup,,,,
Chances are if you are not experiencing a knock, (rod or main bearings) it is probably your cam bearings, again, drawing on common SBF issues...
Best case scenario (but not real likely) would be a stripped (rounded) oil pump drive shaft, might be worth pulling the distributor to take a look. I would probably do this first, (at least you could look at the top of the shaft) right after trying the mechanical gauge.
Last edited by JMD; 06-30-2009 at 10:53 PM.
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