if you have a soldering iron, a drill, and some basic electronics knowledge, then easy as..
the switch is easily mounted if you take out the section of the dash (or watever you're mounting the switch to) and just drill into it.
all you would have to do is find a constant +12v source (cigarette lighter, headdeck, horn etc etc), a nice ground and you're done.
probably a half days work i reckon, depending on how many neons you're mounting