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But if it's the I6... well, I have one for a 90 in mine that's not right. There is no listing for the sender for an 88 or 89, not even at the stealership. I'd suggest just putting an aftermarket gauge in (not an electric one, you'll have the same problem) and grounding the wire from the factory one. That will get rid of the engine light. That solves the problem entirely!
$ 12.00 napa or auto zone.But do it now and put in a real gauge .just do like 89BroncoResto said ground the wire so the idiot light dont come on..good luck..very easy job..
all Ford sending units are about the same back then, you either need one for a gauge or one for a light. Autozone will have one for it. If you have a gauge, then that is the one that you need, even if you also have a light along with the gauge.
Jimmy