Rheostat level

The main instrument unit uses the rheostat value to control the following instrument lighting:

• Speedometer
• Turbo gauge
• Tachometer
• Coolant temperature gauge
• Fuel gauge
• Selector lever indicator (automatic transmission)

With the main lighting turned off and fuse 15 for the daylight driving lights removed, the SID unit sends out Rheostat value 0% on the bus.