George, that was my idea with the four LED's, but as pointed out, it's probably overkill. However, you have a design that won't take up much room and will give you a quick indication if the TIU has a full strength output.
Truthfully, if I were going to spend more time on this, I'd probably try to eliminate the pot and have it trigger on something like 11 volts peak signals, any less and you'd get a no-go.
