Neutral Safety Switch on 66 standard steering column and a 700R4?

[dmjlambert]

If it were mine I would hook up the neutral safety switch already on the steering column. It can be adjusted if needed. You can test it by connecting the 2 tabs to a multimeter and put in ohms or continuity test function, and shift through the gears. If it gives you continuity in park and doesn't give continuity in reverse and drive, you will know it will work to block the key start signal to the starter when you're in gear.