This is about the third or forth time I've seen this thread concerning garage door openers. I simply went down to home depot and bought a very small garage door opener that is about the same diameter as a .50 piece and clips to my belt loop. Problem solved! Why the hassle to reinvent the wheel or add a bunch more stuff trying to glue it to your gas tank, hard wire it to your electrical system. I can use mine regardless of which bike I ride or car I drive in. It only cost me about $35 and I've ridden all over the country and the weather, wind or any other element has caused any harm to it. I don't have to worry about anyone stealing it or having it fall off going down the road.
Just Saying!!