ISSPRO R8588 User Manual
Page 5
Form No. IS074 (9/10/02 Rev. C) Page 5 of 5
Common Applications
Aircore Tachometer Calibration
The following table may be useful in calibrating the ISSPRO programmable tachometers in some ring
gear sensing installations. This information is believed to be accurate, however, exceptions will occur and it is
always best to verify the number of gear teeth when in doubt.
ENGINE
# RING GEAR TEETH SWITCHES SET “ON”
CUMMINS:
L10 103
1,2,3,6,7
475,K6 118
2,3,5,6,7
*NTC, FORMULA (855 series)
103
1,2,3,6,7
*Some models of cabover Freightliners use SAE #1 flywheels and have 118 ring gear teeth.
CAT:
3208 134
2,3,8
3306 156
3,4,5,8
3406,3408 113
1,5,6,7
1693 119
1,2,3,5,6,7
1674 152
4,5,8
DDA- DETROIT
8V71,8V92,
6-71, 12-71,
6V-92 118
2,3,5,6,7
4-53, 4-54
138
2,4,8
w/Auto Trans & # 2 Flywheel hsg
103
1,2,3,6,7
MACK:
All (domestic)
118
2,3,5,6,7
MERCEDES BENZ:
OM422,427,352 160 6,8
GM: 8.2 liter – SAE #2 flywheel
138
2,4,8
(4 ¾” bolt centers on flywheel housing)
8.2 liter – SAE #3 flywheel
126
2,3,4,5,6,7
(4 3/8” bolt centers on flywheel housing)