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Yes there is, but since they rebuilt the pump and installed the wrong shaft I wanted them to correct it. I could have drove the truck to the dealer but didn't want to leave it. All done now and runs great.

Update:Finally got around to taking pump back off truck and took to pump shop. They installed the correct tach drive and all is good. In case any one runs into this kinda thing the correct Cummins part number for the M813 PT pump is 3004979. Was $70 for the drive. They didn't charge to replace...

They rebuilt mine. That was the first thing I asked as I've had that before with other stuff [alt, starters etc]. They couldn't find any other tach drive for it except the standard one. So, I dug some and found in the TM section here someone posted a NHC 250 cummins parts manual. [The one with...

Good morning everyone. I'm working on a 1979 M813 with a 250 Cummins. I had the PT pump rebuilt due to fuel contamination that made a mess of it. I got the rebuilt pump back from the injection shop, re-installed the pump and the truck runs great. However,The tach does not work. I found the...