Yellow Jacket 49867 Titan 2-Valve Test and Charging Manifold degrees F, psi Scale, R-22/404A/410A Refrigerant, Red/Blue Gauges

Can I change the location of the knobs to the outsides?

Can these gauges read R134A?

Do these come with couplers or do i have to buy them seperate? ad does not say

I have a question . This set of gages are all I need but it doesn’t say if they are 1/4 of inch connection size can someone answer this question?