That switch should work fine on 12V. A 6V rated switch is actually more robust than a 12V rated one, based on amp rating. I have a Signal Stat 900 and I think the only difference from the 800 is it has a pilot light on the switch that flashes when the turn signals are activated. The 800 uses a 2 prong flasher and the 900 uses a 3 prong with the pilot contact.
