Mallory Ignition Mallory WINDOW RPM ACTIVATED SWITCH 628 User Manual
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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
2
3
45
6
7
8
9
012
3
4
5
678
9A
B
C
D
EF
0 1
2
3
45
6
7
8
9
012
3
4
5
678
9A
B
C
D
EF
ON
ON
4 CYL
6 CYL
FIGURE 1