Gear compensation allows the fuel and ignition to be individually tuned for each gear.
The fuel compensation table specifies the fuel change for each gear, as a percentage compensation.
The ignition compensation table specifies the ignition timing change for each gear, in degrees.
Gear ratios can be set here.
Select Ratios allows common gear ratios to be selected.
Recalc Gear recalculates the gear from speed and rpm. This is useful to update datalogs if the gear ratios were incorrect when the datalog was made.