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If your using a year one tach harness. I used a 7/8 hole saw. Don’t know about the air grabber.
https://www.forbbodiesonly.com/moparforum/threads/what-size-is-the-tach-hole.108521/
https://www.forbbodiesonly.com/moparforum/threads/tach-wire-thru-firewall.75944/