I got the dial indicator mounted and it works good. A 10 mil movement isn’t much on the knob, but it’s pretty clear on the gauge. And I found when a mortise is off by as little as 20 mils it shows up on the joint if the pieces are the same thickness.
Two sides 0.177 and 0.180:
That is 10x the accuracy I was getting by sighting it.
Here’s the pudding…
-- Doug - When all you own is a hammer, everything looks like a nail.