Here is a picture of the controller(?) in the furnace where the old thermostat and fan switch are connected. Ideally, id' like to run the additional wire to the thermostat as well to control the fan there rather than the separate wall switch.
Also... will there be any difference between connecting G for the fan and using the furnace's delay setting? If I connect G will the fan start immediately on a call for heat or will the delay setting still take affect? If I disconnect the delay jumper will the thermostat handle the delay?