BPine, is yours a push-pull type switch, similar to the "2-speed rear end" style switch on the shift lever that BD uses? That's what I have, and I like the feel, size, and location of the switch. If the switch you're making is similar to it, and mounts in the same 2-piece aluminum mount, I'll take two of them (one for my Gear Vendors overdrive, which doesn't rattle, but I'd want it to be the same as the exhaust brake switch).
One thing, the Gear Vendors switch is probably a double-pole/double-throw switch, because there are 4 wires leading to it. Will yours be available as a DPDT?
Andy