what can cause no oil pressure in a 1998 ford f-150?

Check the oil LEVEL. If it isn't low, then it could be your oil pump, head gasket, or really a different number of things. Your best bet is to take it to a mechanic. Sorry, but that's a bad thing there. It could be a simple 20 or 30 dollar problem or it could be a 1000 dollar problem. Good luck :D
 
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