I found this table online and I apologize for forgetting where, I’d like to be able to credit the source. I think there have been posts on the Samba with the same info.
In any case, the VW is used in Bentley procedures to test fuel and temp gauges.
David B. commented:
The Vanagon gauges are electrically the same except for the blinker circuit in the temp gauge.
Gauge resistance ~52R, input voltage ten volts plus/minus a half for tolerance of +/- half a needle width.
Top mark ~35R (fuel full or temp ~130C)
Temp blinker starts ~45R (~125C)
100C touching high side of LED ~82R (OE sender)
90C touching low side of LED ~106R (OE sender)
Top of reserve ~170R (adopted in later models as the calibration low point instead of bottom of the gauge)
60C/empty/bottom mark on gauge ~265R
shooftie 
#1 by oldfussbudget on February 15, 2020 - 2:01 pm
Divide the 1301 number by two and add ten works pretty well.
#2 by albell on February 15, 2020 - 2:25 pm
Well heck, that’s easy isn’t it?
No need for table 🙂
Ab
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#3 by oldfussbudget on February 15, 2020 - 2:10 pm
The Vanagon gauges are electrically the same except for the blinker circuit in the temp gauge.
Gauge resistance ~52R, input voltage ten volts plus/minus a half for tolerance of +/- half a needle width.
Top mark ~35R (fuel full or temp ~130C)
Temp blinker starts ~45R (~125C)
100C touching high side of LED ~82R (OE sender)
90C touching low side of LED ~106R (OE sender)
Top of reserve ~170R (adopted in later models as the calibration low point instead of bottom of the gauge)
60C/empty/bottom mark on gauge ~265R
#4 by albell on February 15, 2020 - 2:18 pm
Lemme put that info in the main body of the post.
Thanks
Ab
>
#5 by oldfussbudget on February 15, 2020 - 2:33 pm
I was very impressed with the uniformity of the OE temp gauge sender. I tested two (made several years apart) plus a no-name one from Bus Depot in stirred oil, and the OE ones were within two ohms of each other at all temps 70C and over. The BD one was consistently higher resistance (lower reading)
The fuel gauge sender pretty fancy as well, thick-film resistor like the AFM plate but not as fancy — separate section for each marked division on the gauge, and five laser trims. But worse and worse resolution as you go down — full to “half” has 32 divisions, reserve to empty 4.
#6 by oldfussbudget on February 15, 2020 - 2:10 pm
Just so I can click the Notify box…