PLEASE HELP! Speedo Sensor on TRX350 4×4

Hey guys, if anyone has ANY idea where this part mounts on the 86-89 Honda TRX 350s please let me know! I am in the process of installing a a speedo kit (didn’t come with the installation instructions) and cannot figure out where this part is mounted to save my life! Lol. I have the speedo gear and cable already hooked to the crank case which connects to the sensor shown below, and the only place I can see to mount it so far is to the lower engine/frame mount. The speedo cable is only about 1.5 ft long fyi. Any help or insight on this would be greatly appreciated!

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PLEASE HELP! Speedo Sensor on TRX350 4x4-imageuploadedbytapatalk1444924125.702166.jpg