SupaStox motor/drive side??

[Simmo]

Just built up my Supastox, running HW Excerun and a HPi 13.5t motor. With this speedo I only seem to be able to get the motor running in the correct direction of rotation by mounting it with the Spur/pinion drive on the left side (from the rear) i.e Nearside..

Will that matter at all??

(tried reversing throttle on transmitter, and swapping phase wires on motor, its just speedo seems to "Cog" when I do that.