Joe , If you are looking for a good, clean and reasonable way to connect all your goodies on the BMR shelf I cut a hole to the left of the dash light about 1/2 inch and inserted a grommet. This allows for many wires to be cleanly passed under the shelf to the toys!!! I also added adhesive wire clips to the bottom of the BMR shelf at points to ensure the wires were safe, neat, and out of sight!! As for power.. if only a small source is needed you can indeed tap into the dash light, but if you need multiple connections or higher current, the map light can be the source for a relay to enable/disable a direct higher power circuit from the battery. I ran this to a power strip and made all connections to the strip. This way you can have the power needed and switched by the key to ensure you will not discharge the battery. if you are not comfortable figuring out relays and amperage, you can find complete driving light relay kits at most auto parts stores and they work great!! I am installing a new com unit and will have this all apart in a few days, so if you need photo's for ideas let me know.
'03 Aprilia Capo
'00 1500 Intruder - gone but not forgotten
Looking for the next machine :<)