I second Jim on temp senders that are bad / wrong calibration . Went through that on 70's dodge truck too . Same design as 60 up 300 thermal type-- thermal not used in dash in 57 I know but all this is background information for you . I think it is Ford and Studebaker use similar gauge senders ( thermal gauges were mfg by Atwater -Kent) . So typically on mopar 60 up thermal ---when engine hot , a wrong new sender , = gauge is not up very much . Pulled one off old junker 318 to fix. I am very familiar with thermal gauges 60 up , but not 55-58 (59 ?) which are fast moving and probably meter type dash movements ? Never had a problem with those. But if same sender ohm ranges , as the thermal ;( probably same as gas tank for oil pressure and temp ) and same sense ( low ohms = high reading) , then about 10 ohms to ground should send it to max and about 90 or more to min ( can do that test at engine or gas tank wire with resistors 2 watt is best ----for sure that is approximately right info on thermal gauges , all three of them . Might help you make sure it is the gauge before all that . I do not want to present any misinformation , on the earlier cars , hope this does not confuse you, as not directly applicable, maybe someone else knows ohm and sense of gas gauge sender empty and full in 57 . A place to start to check temp or oil . Maybe FSM has this somewhere in early years? Sent from my iPhone On Oct 18, 2016, at 7:58 AM, Kraus300@xxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
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