3

RPM AND CYLINDER SETTING PRODEDURE

The Mallory Window RPM switch has two RPM settings: a lower RPM to activate the switch, and a higher RPM

to de-activate the switch. For example, suppose you have a nitrous system installed. You might want the nitrous

to only come on above a certain RPM, but to protect the engine, you want to shut it off at an RPM just above your

shift point.

Step 1

Remove the four screws that hold the top cover in place, and remove the cover.

Step 2

If you want 4 or 6 cylinder operation, click the 4 or 6 cylinder switch on the left side to the "ON" position. For 8

cylinder operation, both switches should be off.

Step 3

Set the lower and upper RPM values by selecting an RPM value in the thousands (left-hand switch) and an RPM

value in the hundreds (right-hand switch). Note that on the switch for the RPM value in the thousands A=10,000;

B=11,000 and C=12,000. NOTE: For proper operation, the upper RPM switch should be set at least 200 RPM

higher than the lower RPM switch. The RPM range is 1000 to 12,700 RPM for the low side, and 12,900 RPM

for the high side. If you do not want to use the high-side deactivation feature, set the high-side switches to 12,900

(C9).

Step 4

Replace the top cover and re-attach the screws.

HIGH RPM

LOW RPM

1000's

100's

0 1

9

01

EF

0 1

9

01

EF

ON

ON

4 CYL

6 CYL

FIGURE 1