For use with any 4, 6, or 8 cylinder engine with a 12 V negative ground inductive ignition system.

Unprecedented accuracy:  +/- 0.1%, better than any analog system.

External rotary switches with 100 RPM increments for easy setting.

Operates over 6 to 18 volt range, negative ground only.

Built-in reverse voltage protection to prevent damage if wiring is crossed.

Compact size:  2.5 x 3.0 x 1.4 inches

Simple 4-wire hookup:  power in, coil (-), ground, and tach output.

Compatible with virtually all modern electronic tachs.

Works with any inductive ignition system:  points, HEI, Ignitor and Ignitor II

Random spark stealing when rev limit is met - easy on the engine.