trans coolers

I run 2 of those waffle looking trans coolers side by side in front of the rad but not touching. They are both mounted on a bracket top and bottom.
My transmission temperature gauge is under the dash and the sending unit goes to the line comming out of the tranny instead of the line going in. Don't need to know what temp the already cooled fluid is. Keep lines away from headers. My gauge shows about what yours does...170 cruising around and 210 if I run it hard on a hot day.