1940 for temp gage
 

my 40 coupe runs at 160-170 degrees on a 90 deg day, temp gage goes all the way to hot, changed gage to brand new NOS gage,and NOS temp sender two pole type. gage doesn't work at all. installed my old single pole temp sender. after running about ten minutes it goes all the way to hot, I'm thinking it has to be the sender , not sure why the two pole sender did not work, again i check the engine with inferred temp gun still running at 160-170 ,

Re: 1940 for temp gage
 

The single post senser is an on/off switch I believe. If it is activating it will send the gauge to high but is defective in the first place.

Re: 1940 for temp gage
 

Hmmmm, interesting as I am going through the same issue. I bought a pr. of supposed good sending units and my dash gauge does the exact same thing. I'm using a heat gun just to make sure and so far so good.

Re: 1940 for temp gage
 

Nope, I had it backwards, the two post sender is the fixed temperature on/off style. It is set for around 204 deg. The single post sender is the one that provides a range of readings.

Re: 1940 for temp gage
 

Just for general information, the single pole sensor in my '51 went bad on me and the gauge read LOW. I ohmed it out and compared to some other sensors I had, it was significantly different. (I don't remember the exact values.) I installed another of the sensors (which all "ohmed out" about the same,) and the tempuratue gauge read correctly again.

Re: 1940 for temp gage
 

Keep in mind that the single pole sender is not an ohms style, it is a points actuated King Seeley sender. Unless you are testing it under load and measuring the pulse rate an ohm reading does you no good.

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