Temperature guage

The temp gauge stays in the middle it stayed there in winters and is there in summers as well. It has not move farther towards hot side. I have noted one leak that is in the radiator cap looks minor I have not seen water leaking but a golden trail left by water. I will change the radiator cap today though I did replace the old one with new a month ago as the old cap was leaking a lot I hope this solves the problem. I will have a look at the head gasket. Thank you.
Best wishes.
Talha.