This classic gauge compliments the current range of Stack classic tachos, giving your historic vehicle the accuracy and reliability of a professional gauge as well as the classic look that a historic vehicle needs. Combining digital microprocessor accuracy and a high precision stepper motor needle movement, this gauge provides a new level of accuracy and reliability.Fast, smooth and accurate stepper motor needle drive52mm diameter gaugeWhite back light for night time visibilityIncludes a solid state boost pressure sensorThe gauge is supplied with a remotely mounted solid state pressure sensor (part number ST262249) and wiring harness needed to install. The sensor accepts a push on boost pipe (not included).