I have a B&C SD-8 backup alternator, and would like to be able to monitor the current from it while in use. I've got shunts for it and the 60 amp primary alternator, but you only have one input for shunt current sensors. Can I put in a DPDT switch to let me switch to the backup when it's in use? Calibration may be an issue, but I'm thinking that I can tweak it with a resistor. Maybe there's a better idea to deal with my problem.