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Old 01-09-2013, 11:33 AM   #12
FlyingPenguin
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Joined: Jul 2004
Location: "Where the Donner Party Dined"
Oddometer: 199
The spigot on the new cover is designed to read the pressure on the inside (filtered side) of the filter.
With the spigot machined flat and a groove in the cover, the guage will only read the oil pressure ahead of the filter. If the filter plugs and reduces pressure/flow to the engine, the guage will still read the oil pump pressure on the outside of the filter.
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