Left handlebar switch, also referred to as the engine kill switch for 90cc, 110cc, and 150cc ATVs. Compatible with the 90cc Baja Wilderness Trail 90 (WD90-U) ATV with a VIN prefix LUAH. It is not compatible with WD90-U models with a VIN prefix LE8S.
If your TaoTao's switch has the same number of wires (5) and the connector matches the third image on this page, then it should be compatible with your ATV.