High Energy Ignition System (HEI) Tachometer Signal Filter Most GM 1975-1990

1975-90 GM compatible Tachometer signal Filter.  High Energy Ignition System (HEI) and aftermarket compatible.

Provides a stable reliable signal to the Tachometer for better Tachometer response and performance.

Compatible with aftermarket ignitions systems such as MSD, Holley, Speedmaster.
Compatible with Tachometers that are circuit board driven (usually that would be 1975-1990 GM vehicles). Not compatible with Tachometers that are simply a coil.

Three color-coded wires allow fast and easy fool-proof installation. Provides protection and superior response on all Classic Tachometers.

Includes installation hardware, installation instructions, and trouble shooting tips.

See our Blog post: How a signal filter may help your Tachometer read properly