Looking for temp sensor for perm 132 motor

Does anyone have experience installing a temperature sensor on a perm 132 motor? I want to tow my friend up the local mountain here and I don't want to kill my rig. Anyone know what temperature would be considered too hot? I have a cycle analyst V2.3 and was dissapointed to learn the V3 has temperature sensing capability... I may have to upgrade to that if there are no easy standalone solutions.

It wouldn't be too difficult to rig something up external to the motor using a thermistor and an Arduino or something. But it's really quite odd that a motor manufacturer wouldn't include some kind of temp sensor in their new products...