Scary seeing it up in the air with them on!!!!! On my 66 Mustang I put the back up lights on a toggle switch......two reasons.
1. The transmission back up swith is NOT cheap. It and all wiring was missing.
2. Back in the 70's many guys put the back up lights on a toggle....it was a sign on the street you were ready to race.....so I thought it was a neat nostalgia item for my high school ride!