What size is the tach hole?

[Beekeeper]

What size hole in the firewall for the tach wire grommet?
Someone has enlarged the existing hole at some point. I'm thinking 7/8" but not sure
This a 69' super bee
Thanks for the help

 

[moparjohnny]

maybe someone else will check in, i think it is 7/8 hole. keep that bee coming.

 

[440+6]

Yes it is 7/8

http://www.1970gtxregistry.com/1970gtxN85harness.htm

 

[red 69 runner]

I used a vari bit and carefully just went in until the grommet fit