At only 52 mm, the LED Digital Programmable Mini-Tachometer by Intellitronix is everything you need in a great little package. It is a memory tachometer coupled with RPM activated output and a Blue LED shift light. The compact Mini-Tachometer Programmable gauge is microprocessor-controlled and is compatible with 4-6-8-cylinder engines. Accurate, super bright, and intelligent all in one mini size package. The future of precision is here. Other features include: 2 1/16 inches diameter and 1 1/2 inches deep. Automatic night-dimming. Uses push buttons and digital display to program the switch. RPM Range to 9900 RPM with four LED Digits--the two on the right only read 0s. RPM activated switch function: Normally Open - turn on an accessory at the desired RPMNormally Closed - turn off an accessory at the desired RPM. Functions as a digital tachometer with high RPM recall function. No need to remove cover to program. Over current protection. Short circuit protection. Over voltage protection. Black face gauge with a low-profile tinted lens. Ultra-thin design with a gauge that is 1 inch in depth. Dimmer wire allows the gauge to dim 50% Intellitronix is the leader in daylight readable gauges and has been making digital gauges since 1981. No other gauge can compare in brightness! Easy Install, Lifetime Warranty, Great Price, & Gauges for your very special classic vehicle. FEATURES: AVAILABLE COLORS: White, Red, Blue and Green Lifetime Guarantee Lifetime Guarantee