i have aem ems the coolant temp for the aem is wired right into the sensor on the thermostat housing the same one which i believe controls the stock coolant temp gauge in the cluster.

any ideas why my stock gauge will go up and down all the time from mid to high like its over heating really bad but the aem is only saying it has like a 7 degree change. like sometimes the gauge will be up at the H and the aem will say like 195 degrees which isnt really over heating lol.

any had this problem or know what could cause it?