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well there are oil presure switch sockets available from various parts stores...when I did mine (like 13 years ago) I didnt own a single one. so I either got at it with a wrench or regular 12 pt.
Hit it with PB Blaster and let is sit for a day, it works wonders.
A small pipe wrench might also work. Since you're replacing it you don't really care about tearing up the flat spots.
thanks for the suggestions! I am mainly trying to figure how to get to it. it is located in spot that can only be reached by standing on your head and it is 'recessed' below the manifold level and beside the oil filter. no access, that i have found, from the bottom side.
I'll have to crawl under and take another look. Its been a few years since I had to monkey with mine and I don't recall have issues getting to it. Perhaps the 94 is just different.
Good luck,
Popa Tim
I finally got so PO'd about trying to get the little beggar out I just pulled the oil filter off and set it aside while I did my work. Oil filters are pretty cheap compared to my blood pressure maxing out over a silly problem like that. I usually have several PH8's for my truck on hand. I had to get at the sender from under the truck and through the same hole that I grab the filter with. I also had to buy the oil pressure sending unit socket as I could not find anything in my arsenal of tools that would allow me to get the sender out without destroying it or at least severly rounding out the shoulders. On the plus side I had plenty of room to plumb in the extension pipe and the T-fitting so that I could run a manual guage along with the factory idiot light guage.