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Old 11-13-2014, 01:13 PM   #1
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8.3 Cummins tach reads 0 'til rev then reads 2000 only

I have a 1993 Safari on oshkosh with 8.3 cummings . The Tach reads 0 till reved then reads 1900 or 2000. anybody know the point of input at the engine for the tach
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Old 11-14-2014, 05:36 AM   #2
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Tough question. Some are sourced from the Alternator, some utilize a screw-in pickup mounted at the bell housing/flywheel area and some are sourced from the transmission's speed sensor through the MD3060 trans harness. I can't answer for you definitively but having the Oshkosh wiring diagram would certainly answer your question.. if you have or can find one.
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Old 11-15-2014, 01:47 AM   #3
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Tach reads 0

Thanks Newmar, I did see a screw in sensor at the bell housing, it looks like the one that is the tach sender on my ford diesel.
I wish I could find a wiring diagram for the Oshkosh chassis, anyone have one? Thanks for the help lkghudson
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Old 11-22-2014, 11:14 AM   #4
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Oshkosh forum on the Yahoo Groups. Might want to try & post on that forum. Lots of information.
I have a 93 Pace Arrow Diesel on an Oshkosh chassis. Cummins 8.3. Only work I had done on the dash was having the instrument cluster rebuild by ISSPRO. No idea where my 93 pace get's it's input.
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