Quick project. Bought a momentary press 19mm button from amazon, removed the pins I didn't need (only left common and normally open) and wired it to a cheap garage door remote.
Switch:
Untitled by Uncle Grr!, on Flickr
Wires soldered to button pads
Untitled by Uncle Grr!, on Flickr
Tessa tape applied, hot glue added as a strain releif
Untitled by Uncle Grr!, on Flickr
Remote velcro'd to the tank behind the oil dipstick.
Untitled by Uncle Grr!, on Flickr
Switch:

Wires soldered to button pads

Tessa tape applied, hot glue added as a strain releif

Remote velcro'd to the tank behind the oil dipstick.
