• Digital tach with built-in memory
• Small, easy to mount
• Memory display lasts 30 minutes after car is shut off
• Powered by 9V battery
• Dimensions 3-1/8" x 3-1/8"
• Works on 4-6-8 cylinder mags or distributors
• Maximum RPM reading: V8 up to 12,000 rpm; 4 & 6 cylinder up to 15,000 rpm