Can anyone post a pic of the correct location for the firewall grommet hole for a tachometer on a '72-'74 B-body? (Or describe the exact location)

I know that '71 uses an existing connector on the firewall harness plug, but later years are supposed to have a dimple somewhere on the driver side firewall that marks the spot.

Thanks!

Last edited by 340clone; 10/22/17 02:29 AM.