Where are the reverse lights activated?

[foamypirate]

I was just wondering where the reverse lights are activated on these trucks (column shifter, auto). We swapped a 200-4R into my brothers 70' C10, and I don't think the reverse lights were ever hooked up, even with the TH350 that was in it. We need to get it inspected, but weren't sure where the reverse light switch is. Is it on the column? We do have a switch we can use on the trans if it isn't.

Thanks in advance guys.