Engine Revolution Unit????

[matfew]

Hey,

Been going over wiring as going from rb30 to tb42 and the rb diagrams show a engine revolution unit.


WTF is this and where is it. I can not find anything and seems some of the wiring may need to look at it.

I am pretty sure it has to be in there as a wire off the coil resistor goes to it OR in the cars without this thing there should be a red wire on the ignition barrel which I dont have. So assume I have this special unit sensor thingy lol.


Any help would be greatly appeciated.


Cheers
Matt