CONNECTING THE 636

The RED wire is connected to a switched 12 volt ignition source. Normally, this would be

the wire that supplies power to your ignition system.

The BLACK wire should be connected to a good ground. The place where your ignition

system is grounded is preferred.

The GREEN wire is connected to the TACH terminal of your ignition system.

NOTE: This RPM switch will not trigger properly if connected to coil terminals.

It is designed for use with typical aftermarket ignition system tach outputs.

The stage activation wires require 12 volts to activate them if the MANUAL mode is

selected. This 12 volt signal normally comes from switches mounted on the shifter so

that as the shifter is moved through each position, a different switch is actuated. The

wires for each stage are listed below:

WHITE

Stage 1

YELLOW

Stage2

WHITE with GREEN stripe

Stage3

WHITE with BLACK stripe

Stage4

If the 636 RPM Switch is being used in the AUTOMATIC mode, you must supply 12

volts to the stage-1 wire to reset the unit at the starting line. This can be either a switch

mounted on the shifter OR a separate hand operated momentary-contact switch that is

pressed at the starting line. For example, you could use the roll control switch or trans

brake switch to provide this signal.

The PURPLE wires are the normally closed (NC) contacts. This contact set is normally

connected, and is disconnected when the RPM point is reached.

The ORANGE wires are the normally open (NO) contacts. This contact set is normally

disconnected, and is connected when the RPM point is reached.

OPERATING INSTRUCTIONS

®

4-Stage RPM Activated Switch

Part No. 636

HOW TO SET THE RPM SWITCH

The 636 RPM switch has 3 buttons and an LED display. By pressing the “MODE” button,

the display will cycle through the different RPM settings and the operation mode and

cylinder select mode. The “MODE” display shows which setting is being adjusted.

MODE 1 is RPM setting for stage 1

MODE 2 is RPM setting for stage 2

MODE 3 is RPM setting for stage 3

MODE 4 is RPM setting for stage 4

MODE 5 is the manual/automatic selection 1 = manual, 2 = automatic.

MODE 6 is cylinder select. You can select 3 to 12 cylinders (even-fire only)

The RPM range for the switch is 1000 to 16000 in 100 RPM increments. The display

shows hundreds of RPM (for example, 76 means 7600 RPM).

AUTOMATIC vs. MANUAL

The manual mode only changes the RPM switch when a 12 volt signal is connected to the

stage input. This means that no matter how you shift, the unit will always be in the proper

stage for a particular gear. The automatic mode will change to the next stage after you’ve

reached the shift point in the active stage. For example, if you’re in first gear and you reach

your 6800 RPM shift point. Your shift light goes on, and you shift into second. Once the

RPM drops below 6800 RPM, the 636 will automatically select stage two. This process

continuesuntilstage4isreached.Keepinmindthat,ifyouareusingthe636intheautomatic

mode,youwillcausetheunittolosetrackifyoushort-shiftbeforereachingtheRPMswitch

value.

MALLORY IS A DIVISION OF THE MR. GASKET PERFORMANCE GROUP

550 MALLORY WAY, CARSON CITY, NEVADA 89701

(775) 882-6600

FAX (775) 887-4326

www.mrgasket.com

FORM #1253

(REV. A) 11/99

Made in U.S.A.

Printed in U.S.A.

MODE

VALUE

P/N 636

®

MODE

UP

DOWN

1 – STAGE 1

2 – STAGE 2

3 – STAGE 3

4 – STAGE 4

5 – 1=MAN 2=AUTO

6 – CYLINDERS