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I'm planning on next week getting a actual oil pressure gauge, and a water temperature gauge. I'm sick of the stock oil pressure gauge that doesn't do crap and i know i can convert it. At some point i will replace the factory senders so they work like they should. The water temperature and the oil pressure switch are toast.
So anyway, for the water temperature gauge does the engine always pump water into the radiator or the heater core? I'm going to tap into one of those lines with a flange that the sender can be screwed into. If not i'll just put it in place of the stock switch.