2 inch / 52mm radiator coolant temp gauge w/ sending unit. In-line black aluminum hose fitting with 1/8 NPT sensor port. 100-300'F black face, tinted lens and illuminated red needle. Selectable 7 color LED back-lighting with color recall ability. 1/8" NPT temperature sender passes reading to the gauge. 7 color settings: blue, green, red, teal, yellow, purple, white. Sized by the outside diameter of the fittings outer raised lip. Includes detailed instructions and easy DIY wiring diagram.