need to cut holes in firewall for air grabber cable and add tac wiring

[moparjohnny]

do anybody know what size cutter i need for both of those holes on the firewall? thanks

 

[anthony69runner]

do anybody know what size cutter i need for both of those holes on the firewall? thanks

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/

 

[moparnation74]

I believe the air grabber is 7/8 also......

Its easy to find out....Take a scrap piece of metal....cut a hole....and test fit....

Think out da box......

 

[Hey-O]

Everyone should have at least one of these, step bit. Drill till it goes through the hole. Absolutely love these!!