I saw somewhere that there is an ohm reading for the temp sender when its cold and then when its hot. Does anyone know if the sender I got at the parts store would read the same as one out of the classic parts catalogs?? I have posted about a temp gauge that will slowly make its way to the H after 30-40 minutes of driving, but I have a Fluke meter on the top hose that will say 170-180 degrees. Is it possible that the new sender is calibrated differently then one from the catalogs???