Features:

• 2.5" L x 2.5" W x 0.90" H
• For 4, 6, and 8-cylinder engines
• Compatible with accessories up to 3 amps (relay required to control circuits over 3 amps)
• RPM Range: 2,000 to 9,900
• Overcurrent protection
• Made in the USA
• Has push buttons and digital display (four LED digits) to program the unit
• No need to remove the cover to program
• Short circuit protection
• Also functions as a tachometer
• Ideal for nitrous applications because you can activate nitrous at a preset RPM and then have it shut off before peak RPM

Note: Most late model engines that don't have a distributor or have multiple coils will need a tach adapter for use with this RPM switch.