Driving an automotive fuel gauge

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hey everybody
i'm having trouble hooking fuel gauge arduino.  in normal situation sender variable resistor.  gauge have programmable , uses stepper motor move needle.  has range of 0 - 270 ohms.  full , empty can @ either end , gauge compute proper level , display it.

what i'm having issues making arduino output linear resistance gauge can use.  i've done bunch of research , can't quite find works properly.  things i've tried work nice near 1 end of scale, jump on other end.

i'm not sure how many steps gauge has, i'd have many possible have smooth of sweep possible.

thanks

eric

have try digital potentiometer

http://www.mouser.com/semiconductors/digital-potentiometer-ics/_/n-4c498?p=1z0wjiv&gclid=cptznouf670cfcldmgodrj8aia

0-275 seems standard.


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