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Mack Mechanic

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  1. Greetings all I'm looking for the proper tach dip switch settings for a 93 rd690s. It has an EM7-300 engine. Thanks in advance Tom
  2. I think it's a plastic board. Thanks for the replies.
  3. I am having issues with the low air buzzer not working. The buzzer comes on when you first turn the key on but will not warn you of low air pressure. The low air light light comes on and works just fine. I'm thinking there is an issue with the circuit in the dash. Anyone have this problem? Thanks.
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