Are you trying to unscrew one of the plugs on the oil filter housing? If you want to screw in the oil pressure sender unit to the housing you can remove one of the plugs. I would spray some PB blaster a few hours you decide to unscrew the plug and torch it for about 5 minutes and unscrew the plug. Before you screw in the oil pressure sender just wrap some teflon tape before you screw it in.
OR
You can buy a oil filter sandwhich adapter where it sit between the filter and the oil filter housing. It will have pret tapped ports to attach a oil pressure or oil temp sensors...they usually go for $30-$50 depending who's selling them. Much more simple to install..very straightforward.
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