Ninja,
I would like to chime in on the current capacity since most of your questions were answered by MarkT and dc42.
The 100A physically can handle 125 amps (more in brief moments). Ive tested it constantly at 110Amps. The only issue I see is that linearity seems to suffer after 100amps also heat build up will change the devices' sensitivity. So make sure your connection to the sensor can handle the current(no stainless steel hardware please) otherwise heat would be an issue.
Roy