THERMISTOR TEMPERATURE PROBE/5k ohm, 6 lead wires, 5/8-18 thread with .80 tip 1B3ATEMPERATURE PROBES Thermistor Probe 5/8-18 (.25 thread length) (Lycoming) 1B3AThermistor ProbeDial Range:5/8-18 (.25 thread length)Dial Markings and Colors:(Lycoming)These 1BX Probes are also available as TSO'd Type..