66-70 tach wire fire wall hole size

[SGTPaul]

Hi looking for help with the hole size for a tach wirer in a 68 fire wall. I believe this would be the same for 66-70 model years since the panel is the same. Need the location of the #2 circled item in the photo below. Dimple on the panel shows the location, I just nee the hole size. Thanks,

 

[davek]

1970 B-body clock/tach wiring harness

 

[davek]

7/8 hole,you need the grommet

 

[SGTPaul]

Awesome thanks!