70/73 series 3B dash gauges

[scunginator]

Hi All,
I'm the proud owner of an '85 3B BJ73.
Approximately where on the factory gauge should the water temperature needle sit? Operating temperature for mine is 82*C, but opinions from 88*C owners will be just as helpful.
I'm aware it is not particularly accurate so I have an auxiliary gauge on the way.

 

[Gun Runner 5]

The OEM gauges are notoriously inaccurate however both of mine set slightly below the "halfway" point regardless of ambient temperature. Where are you located?

 

[scunginator]

I'm in Australia, but ambient temperature is 18*C at best at the moment.

 

[scunginator]

I'm doing some testing at the moment to test what various positions mean on the stock gauge - 100*C is on the top white line. 82*C appears to me that it is slightly above halfway. I'll be doing some more testing tomorrow with a variable resistor to get a better idea exactly what temperatures equal what positions on the gauge.

 

[jblueridge]

Please post how you tested along with the results.
I have wondered if it's possible to add resistance to calibrate the gauge.
I also like this kind of stuff as a lab for my students.
Thanks.