[Tigers] Reversing lamp wiring

[genepadgett at comcast.net]

I am planning to install reversing lamps when the motor and trans are re-installed in my Mark IA. My shifter is a Hurst competition plus and I have the Hurst switch made for it that triggers the lights when reverse is engaged. 

I seem to remember from somewhere that the factory wiring harness may have wires already in it for such lamps. If so, where do I access the power to the switch and route it back to the bundle to get to the lights? 

If there are not wires currently in the harness, where do people pick up the power and how do they route it to the lamps? One possibility that occurs to me is to tap into the line that feeds the fuel pump. 

Any information on exactly where they should be located on the rear valence under the fender would also be appreciated. BTW, the lamps I have are similar the rectangular Wipacs, but are made by Lucas (same ones that were used on the DB4's I believe). 

Thanks, 

Gene