[A/S] LP gas detector

[Fritzs@xxxxxxx]

Hi gang,
my 94 Excella came without an LP gas detector. Carol insists she smells gas. 
I found a detector at Bob's RV salvage in High Springs, FL.
My problem is, I don't know what to tap into to power it. Easiest access 
would be the panel below the wardrobe. But which wires would I tap?
The 95's come with one; it mounts up front by the door. Access to power looks 
difficult up there. Is it?
Fritz and Carol