Technical Stewart Warner Gauges Basics

Buy a 600 ohm 5 watt variable resistor,
Wire gage with resistor as the sending unit.
Adjust resistor so you get lowest reading on the gage. Now measure the resistance
Adjust resistor for max indication on gage.
Again measure resistance.

 

Part numbers should be stamped in the side of the senders

 

Us an ohm meter and measure.
It will the cold resistance.

 

Measuring my SW sender, 362-B, It's .42k ohms = 420 ohms at 71degrees Fahrenheit, room temperature.
Even thou this one came out of a SW box, doesn't mean it's a good unit and I have not installed it to verify it's condition.
dumprat could check his unmarked units at the same room temperature to see how they compare to mine.

 

Mine measures.62

 

What scale are you reading? kilo ohms?

 

I don't know, probably.

 

Post #15," JustGary" has a 800 number to call Stewart Warner, bottom of last page.