there are 2 #s on the box 004 545 2432,412 205/7/8 production date 12/87.i have done no soldering on this board except for changing the caps.the speedo shows nothing unusual.i tried to measure the output of the hall sensor at the amplifier whilst the car was at rest no voltage either ac/dc but as i drove the car a voltage seem to be generated but a precise reading was difficult.i assume because my DVM is limited.thanks for your help so far

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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon