Outside Temp Celsius to Fahrenheit

[rlyons]

On my 1989 300TE, how can I change the outside air temp indicator to read Fahrenheit instead of Celsius? Is this possible? Thanks in advance.

[MTI]

You'd think it would be easy, especially since the LCD display is microprocessor controlled and usually such chips have jumper circuits . . . but after taking one apart, identifying the processor and then tracking down the circuit specs, I found that there's no indication that the unit can be hacked to alter the display. You'll have to convert the later model units (2 wire versus 3 wire) to get the different readout.