Don't know why I didn't include this before, but another potential advantage of using a thermocouple thermometer for fuel temps is you can get a dual channel model and hook up a pyrometer to the other channel. Most pyros are type K, anyway. The wiring might be a little dicey, since splicing thermocouple wires isn't as simple as regular copper wiring, but you could probably just put the connector right on the end of the factory pyro wire. Just have to watch polarity.
Heck if you go this route, you can get 4 channel thermometers monitor any four temperatures you want (pyro, fuel, oil, water, tranny, outside, etc.). I think Omega even has a 6-channel switch box, but as I recall it isn't cheap.