GJT - Why not fit a XLR socket to your 7, then make up a short lead with a XLR plug on one end and the "Tamiya" connector to connect to your conditioner on the other. This would then give you a solid, locking connector in the 7 and you could then fit XLR plugs to the GPS, map lights, etc...
I've just fitted a trailing XLR socket, but I intend to put a flush mounting socket into a small box and attach it under the dash somewhere.
cheers,
Darren.