Another great device to use is a wireless outdoor thermometer. I wanted to monitor some underhood temps that were not available from the Scangauge. I dropped the "outdoor" wireless transmitter in a location I wanted to monitor, and put the "indoor" receiver in the cab of the truck. No runing wires.
If you want to monitor your intake air temp on a non-OBD II vehicle I recommend dropping the transmitter inside the air cleaner box with the air filter.
-Jay