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Electronic Speedometer Sending Unit

  1. Locate speedometer pick-up connector. On 911 series connector is located beneath access cover on tunnel between rear seat. Connect a test buzzer or voltmeter across 2 wires.
  2. Lift vehicle and rotate right rear wheel, while holding left rear wheel. Buzzer should sound 8 times for each 2 revolutions of wheel. If vehicle has a limited slip differential, buzzer should sound 8 times for every one revolution of rear wheel. If not, replace sending unit.
  3. Make and break wire connections (between sender and speedometer) as rapidly as possible. Speedometer needle should fluctuate. If not, replace speedometer assembly.
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