Triggering an MSD 6 or 7-Series ignition off its white wire or points terminal requires a Tach Adapter to correct the operation of most voltage-triggered tachometers or fuel injection systems that don't read directly off the ignition's tach output terminal. The 8910EIS is built for current-limiting ignition systems that don't use a ballast resistor.Specifications: Brand: MSD Category: Body Product Type: Tach Adapter Sub Category: Hardware, Fasteners and Fittings Warning: California Proposition 65 Warranty: Manufacturer's Limited 1 Year Warranty Part Number: 8910EIS FAQHow is the 8910EIS different from the standard 8910 Tach Adapter?The 8910EIS is designed for current-limiting ignition systems (non-ballast resistor systems), while the standard 8910 is for ballast-resistor ignitions.When do I need the MSD 8910EIS?When triggering an MSD 6 or 7-Series ignition off its white wire or points terminal on a current-limiting ignition system.What does the 8910EIS correct?The operation of voltage-triggered tachometers or fuel injection systems that don't read directly off the MSD's tach output terminal.{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"How is the 8910EIS different from the standard 8910 Tach Adapter?","acceptedAnswer":{"@type":"Answer","text":"The 8910EIS is designed for current-limiting ignition systems (non-ballast resistor systems), while the standard 8910 is for ballast-resistor ignitions."}},{"@type":"Question","name":"When do I need the MSD 8910EIS?","acceptedAnswer":{"@type":"Answer","text":"When triggering an MSD 6 or 7-Series ignition off its white wire or points terminal on a current-limiting ignition system."}},{"@type":"Question","name":"What does the 8910EIS correct?","acceptedAnswer":{"@type":"Answer","text":"The operation of voltage-triggered tachometers or fuel injection systems that don't read directly off the MSD's tach output terminal."}}]}