Hey, Tricky, I've been thinking about a temp gauge like that for my 1100. Where did you hook it up to get the reading from? Same sensor the stock temp gauge runs off of?I mounted my gauges in the useless right lockable pocket lid.
I purchased the gauges from the local NAPA dealer in Ontario, you should have no problem getting them, JC whitney stock them. They are made, imported, handled or distributed by Iequus 7262 - 2" Chrome Electric Water Temperature Gauge
One is when the bike is at idle, I can tell if my headlight modulator is on or off, especially if I have turned it off at some point out of courtesy to a driver at a long stop light or in a group ride, the needle will fluctuate with the modulation of current.