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Re: Low oil pressure.
I realize this is a ten year old thread, but I just found it useful for reference as I dealt with an identical problem, so here's my .02 in case someone else finds this thread again:
Mine is an '89 GMC 5.7, had similar oil pressure issues, which I traced to the sender down by the filter. Couldn't get the thing out of the brass connector. Tried going at the nut at the top with a deep socket, but that ended up making the sensor housing spin upon the base, still not freeing the lower threads from the brass connector. Was worried I'd have to cut it off and remove the brass fitting (which I didn't want to do because that fitting wasn't loose as with the previous poster).
Final solution, which worked great, was applying some heat. The sealant they put on the threads is quite responsive to heat I think. I have a small torch with a fine, directional flame, put that directly on the connection for awhile, and then it loosened up pretty well.
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