check the obvious stuff first. Alot of people use teflon tape when they install sending units and Ive heard this can be a problem because the sending unit needs a good ground to work correctly... so if the threads dont contact the block well it can mess up the gauge reading.
The other parts you say you replaced. generaly overheating while driving is caused by not enough circulation. So a bad water pump could be the colprit.. or thermostat... the two things that control the flow of coolant.. though it could be a clogged up rad... but like you said, that's new, so I doubt it.
overheating at IDLE is usualy a FAN issue... so maybe teh clutch is shot or there's no shroud... though ov course, a water pump or thermostat could cause the problem there too..
If you're lucky, it might just be the gauge.. though I dont see why it would give certain reading based on idle and driving .... specilay if it's consistant, if it were just a goofy gauge it would be all over all teh time... but I could be wrong
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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