Just purshased three axle bus in Nevada and need to pass through on way to Sacramento area with it. Do I need to go through scales or just entery station?

Busses do not go through scales unless CHP pulls you into them to do am inspection. So just the ag check.

Depends on your weight

Only if there's a sign that says so. It is required by some states

Normally buses don't go through the scales. Just moving trucks and big rigs.

Yes