It's a one piece assembly designed to fit in the standard metal faceplate that comes on the cruiser. The stock faceplate comes off very easy. There should be no metal cutting required, the depth of our assembly is just a bit more than the stock one. Red or Blue are the choices.
As far as adding a temp gauge, that would be nice but not much extra room in a stock panel.
Not sure what additional requirements there would be for TBI? Let me know what your thinking there.
As far as guinea pigs go, all the gauges have years of history, this is just a repackage job so I doubt it.
Thanks