Two electrical questions.
Download a service manual, right here:
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download
69 service manual:
http://www.abodyjoe.com/pictures/Misc. car info/69 dodge service manual.pdf
(I think it shows up as "69 Dart/ Charger")
Wiring diagram index is page 8-96
8-99 is the Dart console wiring figure 6
That connector goes up to page 112, figure 18 On that figure, look at the lower right corner of the diagram, look for GROMMET
Look in that area and find the reference to tachometer
Note that the GREEN feeds through a separate grommet in the firewall out to the coil negative
VIOLET goes to switched power to the fuse box
ORANGE is the tach light
BLACK goes to ground back at the console someplace, just make sure it's well grounded
ALSO if you are running some ignition system BESIDES points or Mopar ECU, such as MSD, refer to your ignition manufacturer. That tach may or may not work with some other ignition systems, or may require a special hookup.