Using PWM should do the trick, but you could also display the fuel level on
an LCD.  You're still going to have to convert an analog quantity(the fuel
level) to a digital value(to be displayed).

----------
> From: PHXSYS <PHXSYS@aol.com>
> To: PICLIST@MITVMA.MIT.EDU; stamps@parallaxinc.com
> Subject: [STAMPS] How to simulate resistance?
> Date: Tuesday, May 05, 1998 10:20 PM
>
> Hello everyone
>
> I want to drive the OEM fuel gauge used on most common vehicles. Current
> gauges use a resistive device to ground to drive the gauge, for example
most
> Chevy use a 0-90 ohm sender ( 0=full, 90=empty) , Ford 160-10 or 70-0 ohm
and
> a few others.How can I use a stamp or PIC to drive these gauges. I was
> wondering if I could use PWM to drive the gauge to ground? I could
utilize a
> different table for each vehicle type. Any suggestions on how I might
> accomplish this. Feel free to offer other suggestions I don't know if PWM
will
> work, but I am sure someone out there has figured out a slick way to do
this.
>
>          Gauge----------------Sender-----------GND
>
> Thanks in advance
>
> Jon
>
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