I have an aux. digital coolant guage hooked up with the sender in the upper radiator hose. I am wondering if anyone else has this setup and if it acts like mine does. This guage will not register a temp. unless it is above 70degs.. Most of the time 90% the guage will always say low in cold or hor weather. The guage will register above 70 degs. most of the time while I am towing. If I am running for awhile and I stop and when I start it up again the guage will register above 70 and then immediatley go back to reading low. I am wondering if this is because of the tstats. It would seem to me that the upper radiator flow would be more than 70degs. This has acted this way from day one when I installed the guage. Any thoughts.