Review on Motorcycle Adapter Temperature Sensor Special by Brian Samuel

water temperature adapter very well made. A few things to note. The hole diameter is smaller than expected. The next smaller adapter has the same bore diameter, so the same amount of coolant flows through it. Even if you want to use this adapter to turn on the temperature switch (single wire), the circuit cannot be closed. You have to drill a hole and touch it to add a ground wire. Otherwise it will not work / cannot close the circuit. Works great for a temperature sensor with its own ground (2 or more wires).