A hidden function of the dual temperature climatronic system:
1 Hold down 'ECON' and press the 'up vent' button (it's next to recirculation). Release both buttons when both temp displays show zero.
2 Turn the left temp knob until the display on that side shows 19.0
3 Turn the fan knob until the left temp display shows 19'1.
The temp display on the driver's side is now a digital speedometer reading in mph.
Using the same method, you can enter the codes below for other readings:
1'0 Interior temperature (as detected by the sensor located in the fan speed knob)
1'4 Interior light intensity (measured by sensor in same location)
4'0 External temp (front bumper sensor)
4'1 External temp (roof) - no, I don't know where that one's hidden!
4'2 External temp (rear bumper)
15'0 Oil temperature
19'0 Speed (km/h)
19'1 Pay attention - that's explained above.
19'2 Coolant temp
19'3 Rev counter (x100rpm)
19'4 Oil pressure
25'0 Voltage
Here's how to reset to normal operation:
Press 'ECON' twice.