Does the TEMP light work on gauge trucks?

[davepl]

Subject line says it all. I still have the idiot light in my fuel gauge, along with BRAKE (which does work). It does not light up while cranking as the BRAKE light does.

If it does work, there's only one sensor and it's a gauge sensor, so there'd have to be some kind of circuit to figure out when to turn it on (unless it just glows as sensor resistance drops, no idea).