ISSPRO R8540 User Manual
Page 4
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.)
Switches Set “ON”
Switches Set “ON”
Switches Set “ON”
Pulses
Per
Rev
1
2
3
4
5
6
7
8
Pulses
Per
Rev
1
2
3
4
5
6
7
8
Pulses
Per
Rev
1
2
3
4
5
6
7
8
193
X
X
X
217
X
X
X
X
X
241
X
X
X
X
X
194
X
X
X
218
X
X
X
X
X
242
X
X
X
X
X
195
X
X
X
X
219
X
X
X
X
X
X
243
X
X
X
X
X
X
196
X
X
X
220
X
X
X
X
X
244
X
X
X
X
X
197
X
X
X
X
221
X
X
X
X
X
X
245
X
X
X
X
X
X
198
X
X
X
X
222
X
X
X
X
X
X
246
X
X
X
X
X
X
199
X
X
X
X
X
223
X
X
X
X
X
X
X
247
X
X
X
X
X
X
X
200
X
X
X
224
X
X
X
248
X
X
X
X
X
201
X
X
X
X
225
X
X
X
X
249
X
X
X
X
X
X
202
X
X
X
X
226
X
X
X
X
250
X
X
X
X
X
X
203
X
X
X
X
X
227
X
X
X
X
X
251
X
X
X
X
X
X
X
204
X
X
X
X
228
X
X
X
X
252
X
X
X
X
X
X
205
X
X
X
X
X
229
X
X
X
X
X
253
X
X
X
X
X
X
X
206
X
X
X
X
X
230
X
X
X
X
X
254
X
X
X
X
X
X
X
207
X
X
X
X
X
X
231
X
X
X
X
X
X
255
X
X
X
X
X
X
X
X
208
X
X
X
232
X
X
X
X
209
X
X
X
X
233
X
X
X
X
X
210
X
X
X
X
234
X
X
X
X
X
211
X
X
X
X
X
235
X
X
X
X
X
X
212
X
X
X
X
236
X
X
X
X
X
213
X
X
X
X
X
237
X
X
X
X
X
X
214
X
X
X
X
X
238
X
X
X
X
X
X
215
X
X
X
X
X
X
239
X
X
X
X
X
X
X
216
X
X
X
X
240
X
X
X
X
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.
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 cab over 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
DDA-Detroit:
8V71, 8V92, 6-71, 12-71, 6V-92
118
2,3,5,6,7
4-53
138
2,4,8
Mack:
All (Domestic)
118
2,3,5,6,7
GM:
8.2 liter – SAE #2 flywheel
(4 ¾” bolt centers on flywheel housing)
138
2,4,8
8.2 liter – SAE #3 flywheel
(4
3
/
8
” bolt centers on flywheel housing)
126
2,3,4,5,6,7