Interesting! I wonder if the SD's EGR computer uses the same chip as the 83 240D's EGR computer? I know the 83 240D EGR computer uses the same chip as the tach amp in an 83 300D turbo, that's how I was able to install a tach in my 240D (in place of the clock) by taking the tach signal from the EGR computer to drive it.
Quote:
Originally Posted by techguy512
Late in model year 1983 they removed it completely from the SD's, and replaced it with a system that uses the EGR computer to drive the tach. All they left was an empty plug with a cap over in on the left fender. If you have an empty plug with a screw on cap that is less than about 2" tall, you have the new system.
This system was also used in the 300d's but not implemented until later.
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