Mostly street car? Race car?
For something that hits the track, somewhere in your line of sight.
If you only need to glance at it occasionally, off the side of the column or at the bottom of the dash should be fine.
Isn't the 2300 the 3 3/4" tach?
For a column mount, the bracket can be clamped to the column; you can use a large worm-drive HVAC hose clamp, trim the tail, and put heat-shrink tubing over it.
Should be some existing holes @ underside of dash if you want it there.