I just purchased a Roady2 XM receiver and will be installing it in my car. To make a long story short, in order to send signal directly to the factory amp, I'll need to cut into the wiring harness behind the dash and put rca connectors on the output of the head unit, input to the amp and I will also have rca plugs coming from the XM unit. I'll need a switch to switch between the head unit and the XM unit as inputs to the amp. I've checked Rat Shack as well as BB and do not like the A/V A/B switches that they have. Couldn't find much on the web either. Anyone have a source for a nice switch, or perhaps plans for a DIY? Thanks !