505 GTD Auto ( sensor question ( again!))

Please, does ANYONE know where the Tacho (rev'o'meter) gets its signal from (i suspected a blue, changing to white wire protruding from a bulbous appendage under the near engine side of the auto box) however failed to find a break in this wire, even removed and cleand the contacts on this wire, the tacho is still sitting there at 0 x 1000 rpm, its not fair, its the only thing left not working on this electrical nightmare of a car, iv fixed everything else, even the turbo, that was a white wire broken right above the drivers side headlamp PLEASE PLEASE PLEASE help me with this one if you can, its really bugging me now lol and the schematic might as well be written in jibberish, it makes no sense to me at all. Thankyou =:)

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PugLover
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