This is the Traxxas On-Board Temperature Gauge.
Great for monitoring engine temperature during operation.

FEATURES: Loop probe end which can be used on most any engine
Large LCD screen
On/Off button for longer battery life
Reads in Celsius and Fahrenheit
RECALL button for highest temperature
Clear splashguard for protection

INCLUDES: One On-Board Temperature Gauge
One clear splashguard
One small piece of double-sided mounting tape
One instruction sheet
One small decal sheet

REQUIRES: Mounting to vehicle
Looping probe end around cylinder head
SPECS: Case Length: 46mm (1.8")
Case Width: 22mm (.86")
Case Height: 11mm (.45")
Probe Wire Lead Length: 229mm (9")