How to "rough in" front end alignment after rebuild?

Wouldn’t ya know it, works great if you remove the dust caps! I know I need the wheels mounted to use the gauge, but I have them removed for adjusting the cam bolts. Just thought I’d pop it on for the photo opportunity.

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I was thinking this tool looks awesome but then it would not work with wheels that you can not access the dust cap when they are installed, or am I missing something?