Home / Avionics / Instruments & Gauges / Probes / Sending Units / Leads / Probe, Water Temp. Probe, Water Temp.$39.60 Probe, Water Temp. quantity Add to cart SKU: INWTP100 Category: Probes / Sending Units / Leads Description Description 2 wire water temp probe / sending unit. One wire to the “S” on the gauge and the other to ground. Threads are 1/8 male pipe. Wires are approx 3′ in length. 100 degrees = 1740 Ohms