Q: Is there a separate temp probe, or is it just built into the instrument?
The temp probe is separate from the instrument itself. It must be installed on the exterior of the aircraft.
Q: Whats included with this unit? Temp probe? Potentiometer for the dimmer? Harness?
Per Specifications in Installation Manual: the External Dimmer Potentiometer and the Harness are included.
Q: What is the max current draw of this Belite Altimeter instrument at 12VDC?
80 milliamps @ 12 volts.
Q: Does this need to be calibrated or not?
This unit is able to self calibrate.