Mill tramming question (non axis tramming?)

Nice! Yeah, that’s my video. I realize indicating off the vise is not ideal, but just getting myself into the ballpark / getting the swing of things. Couldn’t figure out why I was so off with the matched 123 blocks on the table; some unknown user error, but getting the hang of it now.
 
To tram my head, I put a 3/4" rod in the spindle that has a 1/2" hole in it. In the hole goes a 1/2" rod 12" long. In the end of the rod goes a Dial Indicator.

This gives me about 23" span between readings, an I like to get my head withing 0.000,3" when I tram.
 
This subject has come up before. I tram my vise to the mill head as that's what holds the work piece.
If I have a piece that's longer than the vise can accommodate I'll tram the table.
 
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