This is not an original tachometer for 1970-74 Plymouth Barracuda and Cuda models.
The tachometer bolts in the blank panel on the far right of the instrument panel where the block-off plate or optional clock would normally go.
This tachometer is manufactured to work many different types of ignition systems including breaker point ignition, electronic ignition, even MSD or Pertronix ignition systems.
Installation instructions are included.