I'm trying to properly dial in my Flex-a-lite electric fan control box by using my OBD-1 scanner. The ECM temp would read 200* while the dash gage would read 230* which is right? I recently replaced the ECM temp sender unit so I'm wondering if because the ECM temp sender is on the intake and the temp gage is on the head that's why it's different. I'm going to trust the ECM over the gage but just wondering why the big difference. Any ideas ? Thanks Dan..