Michael,
A couple of things. First, if you need a cradle, PM me your address and I'll send you one. I put one on my bike while awaiting the release of the Zumo and I still have the mounting cradle (it should mount up cleanly with the Techmount). Secondly, be careful with the power connection with the Nuvi. I'm not sure whose kit you are using, but keep in mind the Nuvi requires a 5V power source and it must be maintained very close to 5V! If it's not a regulated power supply, but just a diode array to produce 5V, stick with internal battery power and save your Nuvi. I was using brand X motorcycle kit and wound up going through 3 Nuvi's before building my own power supply (Retailer kept replacing the units, but not sure how long that would have lasted). Best advice would be to put the Nuvi in your car and put a Zumo on the bike. The Nuvi (350) works fine to get you from point A to point B, but only allows 1 via point.
Craig