On my B&M Prostick, I cut into the wire going to the starter. I did it so it was hidden in the wiring trough on the firewall. Soldered, of course. My 67 was originaly a 3 on tree car so there wasn't any provision for this switch. Also, since it is primarly a race car, an extra couple wire neatly routed in view wasn't a problem. If I were more concerned about looks, I'd splice in at the starter and route the wires so they come up through the floorboard under the shifter. I didn't worry about the backup lights
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Pat Kelley
66 El Camino, daily driver
67 El Camino, STRIP/street