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It is true that the Mallorytachsnormally do not require an adapter. It's possible that the tachsignal wire(the wireconnecting the tachto the box) is picking up noise and causing the tachto read incorrectly. Try relocating the signal wireso that it is not within 6-inches of any other wiresrunning in parallel with it.
Mallory tach with 6A - Holley Performance Products
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Mallory Tachometer Wiring Diagram - schematron
Mallory PRO TACH® I, IV and IV. NOTE: Mount the Mallory Fuel Injection/Tach Adapter away from hot Wiring diagrams for this unit are shown on the back of this instructions sheet. REDtion wire, such as Mallory PRO SIDEWINDER by the actual tachometer manufacturer.
Mallory Tachometer Wiring Diagram
Wiring diagrams for this unit are shown on the back of this. tor and coil in the wire from the ignition switch (see diagrams for more infor- mation on lem, install Mallory's Fuel Injection/Tach Adapter
Mallory Tachometer Wiring Diagram | Wiring Diagram Database
Mallory tachometer wiring diagram schematron mallory tachometer wiring diagram mallory tachometer with rev limiter and shift light mallory tachometer adapter installation instructions mallory unilite distributor installation instructions unilite distributor holley performance products mallory tachometer wiring fordstrokers simple tach
PDF fileThe Mallory Fuel Injection and Tachometer Adapters Part Nos. 29074 and 29078 supply the proper signal to the vehicle computer to operate the fuel injection system. Installation procedure and diagrams are supplied with these adapters.
Mallory Comp 9000 Distributor Wiring Diagram
Wiring tor and coil in the wire from the ignition switch (see diagrams for more infor- mation on lem, install Mallory's Fuel Injection/Tach Adapter Part No. Special wiring harnesses simplify the installation of the HYFIRE® ||IA. wiring procedures as stated in the instructions for the ignition control.
Mallory HyFire Electronic Ignition Control
PDF fileThe HyFire® Ignition features a Tach Output wire that provides a trigger signal for tachometers, a shift light or other add-on rpm activated devices. The Tach Output produces a 12 volt square wave signal with a 20% duty cycle. Some vehicles with factory tachometers may require a Tach Adapter to operate with the ignition. For more information
How to Install a Tach / Tachometer Installation (Autometer Custom fit application Mallory Ignition Mallory HYFIRE VI SERIES OF ELECTRONIC

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