[PDF] INSTALLATION INSTRUCTIONS TACh AdApTER INSTALLATION INSTRUCTIONS TACh AdApTER ® 2650-561X-10 Rev.C CAUTION!!! The Tach Adapter cannot be used with a Capacitive Discharge Ignition (such as an MSD Ignition Control). The voltage on the coil positive must be below 18 volts. Installation Parts Included: 1 - Tach Adapter 9117 1 - TACH-ADAPT - ashlocktech "I was really stuck with the MSD box on a 70 911T. Tried the MSD tach solution and no-go. Talked to MSD , that didn't work. I contacted Bob after reading the positive reviews and decided to try his product. After spending 5 hours on the MSD unit, it took us only 30 minutes with Bob's Tach Adaptor to get the tach to work again. Porsche MSD 8920 Tachometer Adapter - Pelican Parts Porsche MSD 8920 Tachometer Adapter. Time to Ship: Ships Today! Restrictions: This item is non-returnable except for warranty replacement - applies to books, posters, tools, and electrical items . Electrical items are non-returnable except for an approved warranty replacement. Porsche 911 (1965-1973) - Electrical - Ignition Ignition for Porsche 911 (1965-1973): Distributor / Dielectric Grease, Distributor Support Parts, Ignition Control Modules Provides a moisture proof barrier that lubricates and protects electrical connections and wiring. Brand Rating $ 10 $ Ignition Control Modules MSD-8910EIS Tachometer Adapter. Part #: MSD-8910EIS [ More Info 1980 Porsche 911SC distributor connection Nov 19, 2009You will also need a MSD Tachometer Adapter part number 8920 for magnetic pickup distributors, like the one in the Porsche 911 SC. You need the tachometer adapter because the MSD 6AL can fire multiple times below 3000 RPM. The tachometer adapter assists the tachometer to accurately read the signals from the MSD 6AL.