[Indyuke]

Yes, use the lockup. But you don't need a lockup kit. If you run a simple 12v (key on, engine running) source through the 4th gear pressure switch on the trans valve body, the TC will ONLY lock up in overdrive. Once you're at speed and the trans shifts into OD, then the TC will lock up. As you slow down and the trans downshifts out of OD the TC will unlock. No issue with stalling out at a light.

When I first set up mine, I did the whole kit that incorporated the brake light switch and the vacuum switch. It was all extra wiring that added no functional value to the lockup operation, so I simplified it to what I described above.