I recently added a temp gauge just to try and catch any heating issues with the non-shrouded fan design. I planned to use a mechanical and tap into the T-Stat housing but unfortunately found the port too small so I went electric. For those who might consider this little add-on the port is M12 x 1.5. I've attached pic of the plug and the installed SU. Incidentally I went with a "Dakota Digital" digital readout gauge and their SU.