You don't need the T anymore, it was an outdoor thermistor.
The wiring for the Baystat is:R - 24 volt hotY - Compressor
O - Switch-over valve on heat pumpG - BlowerT - Thermistor
W - Heat
X2 - Auxiliary heat during defrost
B - 24 volt commonF - Fault light (no wire)U - Utility light (no wire)
The L should be the only unused terminal on Honeywell