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Firewall hole location for Tach wire

westie47

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I'm adding the in-dash factory tach in my Coronet and am wondering where the tach wire passes through the firewall. Any pics with location/hole diameter would be appreciated. My search on here didn't turn up anything.
 
right side of the black mark nexted to the bulkhead, there is a dimple

upload_2021-12-31_16-27-18.jpeg
 
This is my 68 Coronet R/T factory rally dash with Tic Tic Tach... The same as a Charger...

Screen Shot 2021-12-31 at 1.46.56 PM.png
 
Yes, I am wanting everything to look correct, plus the tach wiring harness already has the grommet on it.
 
What size is the grommet? Measure the OD but inside of the lips.
 
Well... I'm gonna call it 7/8" 7/8" = .875 the hole actually measures .886, so .011 oversize...
 
I used a step bit just yesterday and stopped at 13/16 and the grommet fit
 
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