Hooking up an OEM rallye tach
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