My Vtec Gives Hugs mmmbah
Join Date: 2007-12-13
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make sure the oil pressure gauge is powered through a fuse in your dash that is only powered when the key is in the on position.
Another thing you can do is hook a multimeter in-line from your battery cable to the battery and start pulling fuses. When you see the multimeter reading drop suddenly then you may have found the circuit responsible for the draw.
Hope this helps.