<VV> Universal Sender Unit

[John Beck]

That error seems pretty acceptable when compared to some of the factory
guages I've seen on much newer cars.  If accuracy is important, I think
it would be possible to adapt the 90 ohm sender using an op-amp and a
few resistors, rather than just a resistor.  The parts total for the
conversion would rise to about a buck.  Might be a fun project though. 
--J.B.

N. Joseph Potts wrote:
> 
>      The maximum error for the resistance-error function (a quadratic
> formula that I wouldn't have been able to differentiate by hand) occurs when
> the tank is 61.8% (about 5/8) full. At that point, the substitute resistors
> would cause an indication of 33.8% (about 1/3) full.