Question on what size of drill bit to use to drill hole in the firewall plug to run your main wire and egt probe into cab of truck?
Want to make sure I have all tools ready as I am waiting for my MM3 tuner to be delivered on Monday from DRD
I have watched the over view and many other videos but none seem to say what size is needed
Also is there a grommet that will fill hole and let wires pace through it?
Thanks all
Excited !
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