I picked up one of the Scangauge II's, I couldn't get the trans temp to work so I'm sending it back. I bought an oil temp gauge, a well as a True-cool trans cooler. I replaced the tiny small one with the M7B (I think it was the number). I used the stock lines, had to put some brass fittings to make it work, put a Tee into the driver's side for the temp sensor. I then made a bracket and mounted the gauge under the ash tray area. It's always on, no need to mess with the Scangauge wires, etc. If anyone wants pics, I can send.

 

I bought an Autometer Trans Temp gauge to go in my 3 gauge piller pod.
Temp sending unit went in the lower trans cooling lines (witch is the hot line going to the trans cooler in the rad).