4000 Models
- Check battery and voltage stabilizer for proper voltage. Remove center console. Start engine.
- Connect Tester (VW 1301) between gauge and ground. With dial set to 422, gauge should read 60°. With dial set to 146, gauge should read 90°. With dial set at 53, gauge should read 120°. Keep tester connected for a minimum of 1 minute to allow gauge to reach checking range.