[SRGN]

There's no single unit that I know of. If you are handy with electronics, you can build a board that triggered a relay when voltage feedback through the gauge circuit hits a predefined threshold, and use the relay to activate the light. You could alternatively find a thermostat housing that has a threaded fitting, and use it for the warning light.

[hutchwareltd]

Thanks, that's a great idea. Could even fab up a little can or cylinder for it.

Originally Posted by SRGN

There's no single unit that I know of. If you are handy with electronics, you can build a board that triggered a relay when voltage feedback through the gauge circuit hits a predefined threshold, and use the relay to activate the light. You could alternatively find a thermostat housing that has a threaded fitting, and use it for the warning light.