This is the coolant temperature sensor for the gauge for 88-92 2wd Vanagon and 92-98 Eurovan. It is a Black 2 Pin sensor with a fuel injection style plug. 20mm body. If you have an '86-87 Vanagon then you need 251919501. You will also need o-ring N90316802.
The picture is showing two views for clarity. You are only getting one sensor.