bennelson -
From what I have read, different car makers had to comply with the OBDII standard by 1996, but may have been implementing parts of the standard before that year, i.e. in preparation. It *might* be that the truck will talk to the ScanGauge, but not report all the data. In the table you showed from ScanGauge, it *might* be that the programming for the 4.3 liter S10 was more advanced than the programming for 4 cylinder.
I can see from the picture that the connections are different. My car is different too.
I would send ScanGauge an e-mail and see what they say.
EDIT: The ScanGauge can be transferred to the Sunfire, no problemo. You just have to set the engine size and tank size.
CarloSW2
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