Mark Drillock posted conversion factor for the VW tool 1301, something like divide by 2 and add 10 to get ohms. In any case, good ref. for ohms vs. VW1301 tool and trouble shooting gauges can be found here

http://www.bentleypublishers.com/tech/vw/bentley.vw1301.testing.htm

alistair

On 2012-06-19, at 9:39 AM, Stuart MacMillan wrote:

> My gauge never goes up to the full mark.  Now I'm replacing the tank and
> have the sender out, and sure enough, when the fuel sender arm is up to the
> top the needle is about 1/8th inch shy of full.   Bentley does not have ohm
> readings for the sender, does anyone have a new one lying around they could
> test for me?
> 
> 
> 
> Or, should I just replace my 27 year old sender as a preventive measure?
> 
> 
> 
> Thanks!
> 
> 
> 
> Stuart
> 
> '85 Westy