Tire Pressure Monitor System: repeater & inline switch

The instructions for mine said it was "weather resistant", but I from looking at it, I did not think it looked like it should be mounted full time outside. I have a small solar panel that I connect to the battery when the trailer is in storage that uses one of these 12v connector, so I picked up one at an auto supply store, and put the repeater on top of the battery with Velcro - the box is pretty well protected as it is tucked under the "nosecone" of the trailer. Seems to work fine, and can easily be removed and put away when not needed.

Edit: It is nice to have it where you can easily view it during pit stops so you can see whether or not the LED pilot light is on ....

The Tire Tracker TT-400C is the same unit, different box. The repeater is NOT waterproof and is to be mounted inside. I installed mine in a night stand with Velcro, out of the way and wired it to a reading light above the bed. Turn the light on when traveling and your drop outs are gone.

WDP

Mine doesn't appear to be weatherproof. I will be installing it this week. Our TT has a front storage compartment, with 12V lighting inside. Since the trailer is a fiberglass, the RF will transmit easily through the skin. A simple 12V type switch from Radio Shack (if you can find them still in your area), or any automotive type shop. All else fails, even Walmart sells them in their automotive/electrical section.

If yours is waterproof, and still want a waterproof switch, any marine supply store will have them. If you don't have those in your area, check out West Marine online.