Adding a rev counter to a dizzy engine

i feel like this is something wich has been discused on here multiple times. However everything i seem to find on here seems to be helpfull.
So long story short i have a 1996 k11 with a dizzy engine its a 1 litre if that should be important and i want to ad a rev counter,
i know that i need to grab the signal from the negative side of the distributor but wich wire? the black one or the blue one?
 
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