4wd indicator lights?

just finished a 2wd to 4wd conversion and wondering if there is a way to wire up the indicator lights? converted a 97 with a 242/aw4 setup. the switch on the tcase is electronics, so no vaccum lines to deal with. i'm sure it is just a matter of wiring the switch to the tcu, but how?

Why bother?

My idiot light circuit is dead and I don't miss it......

The circuit is simple, dash (guage) power to the light, then to the switch that provides ground to complete the circuit....

Here is the 1987 wiring, others should be similar:

i really don't care but it would give me something to do while i wait on the lift kit:greensmok