dang sorry so long for a reply, mines runs right at the second thick tick mark.
if yours is like that you might have a leak, or need some more antifreeze. when I had a small hole mines would run like that and take forever to warm up.
All the tahoes run at the same I have a 96, if you go on ebaymotors you can
look on the pictures and see where most of them are at for the temp.