SR rev counter

ok ive seen some stuff on here make this work but there are no longer pictures on the pages ..
Can any one tell me witch wire it is on the Black plug (back of rev counter that I link into ??)
 
really no one as any pictures on this .. yes ive serched yes ive found stuff but all the threads are so old that the pics have expiered and would like abit of help knowing what wires go where in a pre facelift to get the tacho working !
 
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