Help with Cooling Issue Please

when I took it back to the shop the owner was not there...another guy used some kind of laser light and send where the connection on the intake manifold is the temp was 210..and 190 at the bottom radiator hose as it was at an idle but the temp gauge read 230...i left the car there and told him for what i just paid they are going to make it right or the **** is going to hit the fan!!! oops..no pun intended