Unless perhaps the VSS from the civic is being used on the GSR tranny (might fit fine, not sure) and perhaps it's calibrated differently. It might not matter, that might not be the issue regardless, just throwing it out there.

White_n_slow is right about the redline, 6800 to be exact. Not sure about fuel cutoff, but I'd bet it's lower than that of the D16z6 that came in the '92 Si.