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Differences in Tachs for W123 between 82-84?
Hi guys,
I'm trying to replicate Funola's DIY tach on my 1983 240D with Manual tranny. DIY tach for 240D w EGR- easy! I am assuming my 83 has EGR (gotta check that) Funola used a tach/clock out of a same model year (83) 300D with automatic. He was able to very simply swap in the tach and run a signal wire from the EGR controller. I have found a source for either an 82 or an 84 tach. However, in testing the tachs, here's what he said: The calibration appears to be quite different between the two model years. Results: 1982 5000 rpm at ~80 Hz 1984 4500 rpm at ~10 kHz (seems to have different pickup signal vs. 1982) I suppose that I should simply pick up an oscilloscope and figure out what signal is coming from the EGR controller, but do you guys happen to know which of the tachs I should get? Thanks much, PE
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83 240D - 4 speed manual - Manilla Beige 189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too! |
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