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Using the 1993 speedometer and circuit board the only thing I needed to change to get it to work was to reverse wires #1 and #2(speedometer sensor wires) on the "L connector(233)" harness. For some reason(I don't know why) these 2 wires are reveresed on ABS and non ABS vehicles. The L connector harness on the 1993 was 1(black), 2(green/white) and 3(blue). On the 1990 it was 1(green/white), 2(black) and 3(blue). I noticed this on the wiring diagram for the speedometer in the Bentley page 390-51 vs 390-63. To reverse the wires I just popped open the cover on the L connector harness and swapped #1 and #2. No cutting soldering or anything else required.
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