I believe the TSDZ2 circuit board has the inputs for the throttle, but for the 6-wire display, they leave the wires off. Why maintain two versions of the circuit board?
Check this link, and you may wish to look at your circuit board to see if the three inputs are there. The main one being the pad for the throttle signal. You'll always find +5V and ground somewhere. No need to run the throttle thru the display if the inputs exist. Just run a separate throttle cable from handlebar to motor?
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Now you might have to update the firmware to tell the circuit board there is a throttle. I dunno about that. Also, the throttle on my TSDZ2 is mainly good for verifying the motor works on a ore-ride checkout. It's very weak, although it can be used for a start from a standstill, if a climbing gear is picked.