Historyskyz said:
The 2 wire throttle connects to board and this sensor thing.
Based on the complexity of that board, it appears to be a processing board that does varous input *and* output, and almost certainly is using the two wires as a digital connection to the controller for bidirectional serial data about all of it's various functions.
That means that it almost certainly can't simply be connected to two controllers, or the data stream won't be readable by any of the devices that are connected.
If you did want to test it, and the two controllers are identical, then you would connect the second one exactly like the first, in parallel with the first, so the serial data would be read by both. However, if the either controller *sends* data on the connection that will *also* be read by both, and may interfere with system operation.
It *shouldn't* hurt anything to do this, but there is always the chance of damaging things, either the original stuff or the new stuff, so anything that blows up is your responsibility.
To be more certain of the outcome, you'd need a completely separate board like that, including throttle assembly and anything else it needs, for the second controller, so that the only interconnection between the two motor/controller systems is at the battery.
If there is an option for a system prebuilt to do 2WD it's probably easier to do that.