DeTomaso Mailing List: July 2001, Message #90

None of there gauges have the correct impedance match for a Pantera.  They
are also unable or unwilling to modify one for our application.  Resistors
will not improve accuracy with any of their gauge applications in a Pantera.
Which
gauge did you purchase?

My '73 Pantera fuel sender's impedance is 200 Ohms empty and 0 Ohms Full.


Desirous of matching gauges, I compromised and purchased the Autometer fuel
gauge that reflected empty at 240 Ohms and full at 30 Ohms.  I then
extracted my sender from the fuel tank and bent it to provide more accurate
readings across the scale.  This was easier as I had the tank out of the
car.  However, it was a challenge to get the tank to sit at the same angle
which affects readings. I would add 5 gallons of fuel at a time to confirm
gauge readings.  As I was more concerned with accuracy at the lower end of
the gauge, I focused on getting 5 gallons to register at 1/4 tank ( 20 gal
tank).  In the end, 5 gals registered just under a 1/4, 10 gals registered
just under 3/4 and 15 gals (obviously 20 as well) pegged at full.  This was
a compromise that I could live with.

A superior and more costly solution is to acquire a different sender.  These
are available.

I wish you luck.

JT

----- Original Message -----
From: "Dr. Alex Petro" <apetro@tampabay.rr.com>
To: "Multiple recipients of list" <detomaso@realbig.com>
Sent: Wednesday, July 04, 2001 12:15 PM
Subject: gas gauge


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> can anyone tell me how to get my new autometer gasgauge to read correctly?
Iatttempted to hook it up to the existing wires but the gauge reads over the
full line.  Do I need toput some resistors in the circuit?  Alex
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