Well, I know that they hook up 5 volts straight to them, no biggie (I will be doing this on my e-bike project shortly):
And the out is going to the high impedence mpguino connection, so not much worries of high current there (<0.00024 amps at 12 volts).
If I were worried about it, I might try hooking up the sensor with 5 volts at the source with a millampmeter first and if it is less that 1/3 of max current then assume I could hook it up to 12 volts?