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I keyed in FICM, IPR, ICP, EOT, and boost. I will eventually add in the tranny temp, and the egr codes just haven't taken the time to do them yet.
The 4 i watch consistently (lately anyways) are ECT, EOT, Volts and FICM.
I have both the ICP gauges psi and volts, and the one IPR gauge %.
Since I have an 04, and don't have the stock boost gauge,So I did do boost. And you need to follow the directions to find which Xgauge will be best for your elevation.
As for Horse power. I have never bothered with it. So, I really can't say how accurate it is.
I have never messed with the horsepower deal but the boost seems accurate. It matches my factory gauge. Also setting up the boost xgauge has a special code for different year models.