How do you connect an A B timing light on an em7 mack engine?

To connect an A B timing light on an EM7 Mack engine, first, ensure the engine is off. Attach the timing light's power leads to the battery (positive to positive and negative to ground), then connect the inductive pickup around the number one spark plug wire. Start the engine and aim the timing light at the timing marks on the engine's harmonic balancer to check the ignition timing. Adjust the timing as necessary based on the manufacturer's specifications.