1975-92 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. Filter out electrical noise, ignition caused high voltage spikes, and aftermarket ignition modules.
Compatible with aftermarket ignitions systems such as MSD, Holley, Speedmaster.
Compatible with Tachometers that are circuit board driven (usually that would be 1975-1992 GM vehicles). Not compatible with Tachometers that are simply a coil.
Three color-coded wires allow fast and easy fool-proof installation.
Includes installation hardware, installation instructions, and trouble shooting tips.
Provides protection and superior response on all Classic circuit broad driven Tachometers.
See our Blog post: How a signal filter may help your Tachometer read properly
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high quality, good price, complete with instructions