This is how I mounted my 2610.

Some of the things under consideration:

   1) I wanted power all the time .... didn't want to reboot everytime I got gas.

   2)  Wanted a connection that I could do easily.  BNC connectors offer "bayonet" type easy on.

          Another side benefit of BNC connectors is the "hot" lead is almost totally protected.

  This is the view from the drivers perspective:

  I use 1 inch alum 90 degree barstock.  The angle provides rigidity even though it is cantilevered out.

  Under the barstock I use a small alum LMB chassis to protect the solder connections.

  From under the LMB chassis I run a 2 conductor 22 awg inside a shielded jacket down thru the nacelle

      From the nacelle it wraps around to the other side and back down under the tank to the battery area.

          I used an inline fuse very much like this:

  More views:

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  When I disconnect the gps it looks like this

  The bracket alone looks like this

 I put a BNC connector that has no connection to keep the unit clean when not in use.

  It also makes it water proof.

From the drivers perspective: