540 vette

I converted my 72 from auto to 4 speed. And can't figure out which firewall hole the cable goes thru. I found this picture (from 69 but should be the same.) while searching and they used #4. I checked and I don't have that hole drilled on the firewall. The hole is in the insulation but is not thru the firewall. Now I can drill a hole or I can run it thru the hole for the auto, if it is different. Which hole would the auto use?

tpfarm

Hey 540; my speedo cable on my '73 4 speed goes through hole #4 in your picture.