The Distributorless Tach Driver makes it possible to install an aftermarket tachometer on a vehicle that has no distributor and runs multiple coil packs. The compact 1.5" x 3.5" x 2" housing is potted in polyurethane for vibration and water protection, so it mounts easily under the hood. It wires inline on the coils' 12-volt supply and converts the current pulses into a clean 12-volt output signal that most aftermarket tachometers use as a trigger.Specifications: Brand: MSD Category: Body Product Type: Tach Driver Sub Category: Instrument Panel Warning: California Proposition 65 Warranty: Manufacturer's Limited 1 Year Warranty Part Number: 8913 Works on 4, 6, or 8-cylinder engines. Not for use on odd-fire engines.FAQWhat does the MSD 8913 Distributorless Tach Driver do?It lets you install an aftermarket tachometer on a distributorless, multi-coil-pack ignition system by converting coil current pulses into a 12-volt tach trigger signal.What engines is the 8913 compatible with?4, 6, or 8-cylinder engines. It's not for use on odd-fire engines.How is the 8913 installed?It wires inline on the coils' 12-volt supply wire and mounts under the hood in its compact, weatherproof housing.{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What does the MSD 8913 Distributorless Tach Driver do?","acceptedAnswer":{"@type":"Answer","text":"It lets you install an aftermarket tachometer on a distributorless, multi-coil-pack ignition system by converting coil current pulses into a 12-volt tach trigger signal."}},{"@type":"Question","name":"What engines is the 8913 compatible with?","acceptedAnswer":{"@type":"Answer","text":"4, 6, or 8-cylinder engines. It's not for use on odd-fire engines."}},{"@type":"Question","name":"How is the 8913 installed?","acceptedAnswer":{"@type":"Answer","text":"It wires inline on the coils' 12-volt supply wire and mounts under the hood in its compact, weatherproof housing."}}]}