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Ch 1996 Limits Rpm

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My truck is no limits in the rpm, it past to 2300 rpm, when it will be 1800-1900

how I can to control it?

what tool I need to do it

where I buy this tool

this truck have engine 350 HP Vmac system.

Help me please

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The dip switches on the back of the tach could be set wrong and then the tach would be off. Take to a mack dealer and let them plug a ProLink to it a see what the rpms are on the ProLink. If rpms are really 2300 the somethings wrong with the injection pump.

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