Is there a way I could print the limit of a category to say a hud?
Assuming URS is old school, and uses flat files in the DATA folder, then you can have server side grab the cvar's set data from the file, and move it client side to a HUD.
Though I don't know too much about cvar's though, and you might be able to actually grab that cvar data from a command that garry's mod has, like:
local whatever_cvar_name_is = GetConVar( "wire_lights" )
print( whatever_cvar_name_is:GetInt() )
I don't know if cvars are client or server though, I lack that information on them, but you can try to see if the above command would work for you.