OK I installed it and it seems to work. The new one had 4 wire terminals, two (optional) of which had something to do with the thermostat. In my case I just went with the original wiring where the fan runs on heat it senses only. BTW the box calls it a CAM STAT whatever that means. There is a better photo of it here out on the web:
So regarding adjustment... I think the fan runs a little longer than it should at the end of the heating cycle. It tends to blow a little cool-ish air before it finally shuts off. The temp is set for 95 out of a range of about 90 to 120. That's how the old one was set(95). So should I raise the dial a bit to say 100?