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Re: 1998 Sunfire with Temp Guage issue.
If the gauge sweeps with the bulb check, it's not in the cluster. See what the PCM reads for ECT, it's probably a broken/shorted wire between the ECT sensor and PCM. I'm pretty sure the cluster is a module by '98, and gets all the gauge info from a serial data line, which means if other gauges are working, it's not between the PCM and cluster. I don't recall the '98s, but I had a '96 2.2L that had the coolant temp sensor in the head right by the thermostat housing. I have seen the ones you're referring to, but haven't had to do much work on them and as a result can't really think where everything is.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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