Dreamer Posted September 20, 2018 Share Posted September 20, 2018 We have a 3.9 4BT cummins engine with a 5.9 cummins engine sensor installed in the bell housing. The Mack Tac goes right around to 6 o'clock position extremely fast when it starts up and pins itself at the 6 o'clock position. The electric Mack Tac # is CE17MT4117M and it has a 6 pin connector on the back. Should this be able to hook up to the 5.9 sensor and operate correctly? If anyone has a wiring diagram I would appreciate it. Quote Link to comment https://www.bigmacktrucks.com/topic/54354-mack-tach-installation-problems/ Share on other sites More sharing options...
Signaturediesel Posted May 30, 2021 Share Posted May 30, 2021 I’m having the same problem on a Mack that was mechanical and now has a different pump with no cable gauge comes on and zores out then when you crank it it buries at 6 o’clock Quote Link to comment https://www.bigmacktrucks.com/topic/54354-mack-tach-installation-problems/#findComment-474540 Share on other sites More sharing options...
theakerstwo Posted May 31, 2021 Share Posted May 31, 2021 500_700_and_900_series_speedometers.pdf (ametekvis.com) This should help you 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/54354-mack-tach-installation-problems/#findComment-474550 Share on other sites More sharing options...
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