I have a switch diagram in my gallery you may want to look at. I'm using two LEDS, a yellow whenever lockup occurs and a red when it's forced via the switch. When the switch is engaged both are lit, makes for a good reminder to turn it off when your coming to a stop. I got it from another TDR member and it works like a charm.
I think TST has some instructions on wiring that you should look at too. You need a jumper wire in place off the trans relay... black box beside the drivers side battery.