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I'm not trying to start an argument but before you compare one vehicles flaws with another you should know there are some things to be taken into account before making a stament that equipment is junk.
I'm not saying that one guage is more accurate than another, but think about it if the method of gathering data is iffy then no matter how accurate the guage its only as good as the collection device, I would esp expect this from a CPS used for engine speed.
Before I go any further does the alero have a gear driven tach or an electric sensor on the crank? What about the camaro? and what yr? Ive done enough with A/D and D/A conversions to know that they take time and can cause discrepancies between devices. The thing to remember is that analog devices, like most tachs, are constantly moitoring a source. Whereas digital is just a sampling at constant timepoints, albeit rather small. In other words digital sources are more prone to error than analog sources. However if the tach in a vehicle is not gear driven analog style and is a secondary output from the PCM or ECU then it may very well be a few fractions of a second behind. I've seen this when looking at designs for building datalogging devices for FMUs as well as the resulting datalogs.
You said the tach climbs faster than the computer, which would lead me to believe, at least in the case of the alero, that it is a true engine speed, and the ECU is trailing, since if the tach was off it would trail not lead. Yet, both the ECU and the tach agree, at least on my car, as to when the fuel shut off adn rev limit is to occur and they agree on the hard code in the ECU and number on the dash. However w/o knowing how the alero or the camaro drives the tach and the ECU I'm not real sure which is more accurate, I can see the case for both. Its just kinda wrong to say that b/c you see disrepencies on one vehicle that does not mean its true on another, esp. w/o know all the specifics.
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