628 Datasheet, PDF (1/12 Pages) Mallory performance club – RPM ACTIVATED SWITCH

INSTALLATION INSTRUCTIONS
®
WINDOW
RPM ACTIVATED SWITCH
PART NO. 628
Parts Included in this kit:
1 RPM Activated Switch Part No. 628
1 “U” shaped crimp-on wire terminal
1 #6 x 1⁄4" sheet metal screw
2 #8 x 1⁄2" sheet metal screws
CONTENTS
General Information............................................................ ...1
Mounting Procedure........................................................... ...2
Wiring Procedure...................................................................2
RPM and Cylinder Setting Procedure....................................3
Wiring Diagrams for the RPM Activated Switch
Connecting to a HYFIRE^® IV.................................................5
Connecting to a HYFIRE^® VII.......................................... .....6
Connecting to relays with a HYFIRE^® VII.............................7
Connecting to a Timing Retard............................................8
Connecting to a Timing Control...........................................8
Connecting to a Light...........................................................8
Connecting to an Electric (Shifter) Solenoid.................. .....9
Connecting to a Nitrous System........................................10
Connecting to a Nitrous System and Timing Retard.........10
Shifnoid Wiring............................................................... ...11
GENERAL INFORMATION
The Mallory 628 Window RPM Switch is an RPM switch that is triggered from the tach terminal available on most
aftermarket performance ignitions. It will not only activate at a particular RPM, but can also be set to de-activate
at a second, higher, RPM. It can be used on 4, 6 (even-fire only), and 8 cylinder engines. NOTE: The Mallory 628
CANNOT be triggered from points or electronic distributor. It must be triggered from a tach output terminal.
The 628 features two independent sets of switch contacts that switch other devices on or off when the selected
RPM is reached. These contacts draw a maximum current of 5 amps. To switch more than 5 amps, you must use
the RPM Activated Switch output to drive a high current relay, such as a horn or headlight (see illustrations).
NOTE: The switch contacts are NOT connected electrically. This allows you to turn one circuit on and anoth-
er off at the same RPM.
MOUNTING PROCEDURE
Step 1
Disconnect the battery (–) cable to cut power to the system.
Step 2
Mount the unit in an area away from hot engine components or extreme heat, such as exhaust manifolds, and
away from moving parts, such as fans, belts, and linkages.
Step 3
Mount the unit using supplied ^#8 x 1⁄2" sheet metal screws.