What you have to look for Ron, is the max current output and operating voltage of what ever device you use. Each device has a data sheet that can be downloaded. I would make sure to get one with at least 20Milliamps output and a voltage rating of at least over 12Volts.
There are latching Hall Sensors out there, so stay away from these.
The Hal 506 that George mentioned is a good choice it has a 50MA max and a 20MA recommended operation current. The voltage is 24Volts Max and operates fine on 12Volts.
The SS443 is also a 20 MA device good choice.