I have a Traxxas Jato and I got a Venom Racing Speed Meter. It works off a magnet that has to be mounted in the sur gear or on a drive shaft. The meter will not work correctly on a two speed vehicle. Does anyone have any suggestions on where to mount the magnet and the sensor arm. I am thinking that I will have to modify the A-arm to hold the sensor arm in its middle. Any other suggestion swould be helpful. Thanks