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One of two possibilities - Check for loose wires at oil pressure sending unit (switch that is screwed into block) If wires are tight, unscrew oil pressure switch and spray clean it with carb cleaner (the bottom part that screws into engine)
I think you have a suspect oil pressure sender unit. Replace it as they are cheap and need to be reliable and it will be cheaper than getting the oil pressure tested. If the light still stays on with the new sender you may have internal wear or a partial blockage. If the light stays on you need to have it urgently checked by a mechanic or you could risk serious engine damage.
if your pressure is too low this fix is quite expensive and not worth for older cars, so the first thing you should try to keep it running is to use THICKER OIL (W20-50 or such), + oil stabilizier (any good oil additive).
I tried it in my Jeep,- helped right away.. Good luck
Yes that switch will work. So will a lot of other parts and gaskets. You have to make sure the engine size is the same. Parts are compatible with the same engine size. Have a drain pan and new oil ready in case the oil does come flowing out.
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There is nothing wrong with buying parts on ebay. If you don't mind the wait, in my experience you will save. Just make sure it is the right on for your truck, but i think most oil sending units for G.M. are pretty much the same, especially the older ones. If you are unsure message the seller, I am sure they will be glad to help. You don't have to drain, just unplug it then screw it off, when reinstalling it I would put some Teflon tape on the threads to prevent any leaks