Hooking up an OEM rallye tach

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I doubt the wiring is even in a non-tach car

You have a factory service manual? Down load one:

http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download

Page 8-149. Theres a wire green/ yellow trace goes from the tack out through a separate firewall grommet to the engine compartment, and ends up at coil -- and a separate dark blue which connects down at the fuse block which feeds the tach

On the Barracuda diagram they show the feed coming off one side of the turn sig. flasher
 
I got a sock style one in my Dart. Trying to remember what I did. I know I ran a wire to the fuse box for key acc power. Then one side goes to the + and the other to - on the coil I think? Sorry been a while. Don't mix them two up or you will fry the tach.
 
I don't know what i'm doing wrong but I can't find out how to hook up the OEM tach on my 69 barracuda......ARGH!
 

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