Well, it's feasible to get a speedo that'll run 2 BL motors... It's all about the amp draw. You need to find one that will handle like 160 to 200 amps continuous. Then just hook the motors up on a parallel circuit. But to find a speedo that would do that, you're talkin some major coin. I know some of the BL speedos for boats are designed to handle dual BL motor setups but you're talkin 400+ for them..