
Form IS121 (Rev B 5/10/02) Page 4 of 4
5” MPU Tachometers
Switch Settings for Pulses Per Revolution
(Note: Switches 9 & 10 must be “off.)
Per
Per
Per
Common Applications
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.
*NTC, Formula (855 series)
*Some models of cab over Freightliners use SAE #1 flywheels and have 118 ring gear teeth.
8V71, 8V92, 6-71, 12-71, 6V-92
8.2 liter – SAE #2 flywheel
(4 ¾” bolt centers on flywheel housing)
8.2 liter – SAE #3 flywheel
(4
3
/
8
” bolt centers on flywheel housing)
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