Well you don't NEED radius gauges. You can set the radius when you setup your action by measuring the distance from the bottom of each string to the 12th fret (or whichever fret you want above the 12th) From E to G the distance will usually decrease a bit. So you are using the fret top as a radius gauge and don't have to buy a set of gauges. Dollar saved, dollar earned.
Exactly!
Keep it simple and save some money!
