Old to new style tank swap

[Chuck]

*I don't know* if it can be wired backwards. If I were guessing, I'd say no. What it requires is  time. We're talking minutes here..

If you haven't used one, as the fuel level drops and the thermistor warms up, the resistance changes. At first the light will just faintly glow, and as the fuel level drops more, the resistance gets less and less to make the light brighter.