NO.So if it only has the one wire, it means that the truck should cut off with the relay removed because the oil pressure switch will be doing nothing to counteract that, correct?
SOME vehicles have two oil pressure sensing devices--one sending unit to drive the oil pressure dash gauge (one wire) and one switch to bypass the fuel pump relay (two wires.)
SOME vehicles--tending to be newer like your '98--have a single, three-wire combination switch/sending unit that does both things.
If you're looking at a one-wire oil pressure sending unit, you're looking at the WRONG ITEM. The 3-wire combination sending unit/fuel pump relay bypass; or the 2-wire fuel pump relay bypass switch tends to be near the distributor, while the one-wire sending unit is down by the oil filter.
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