Dual Gauges
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
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From: Southern California
Dual Gauges
Is it possible to run two fuel gauges off one sender and have them be accurate? Or will that split the ohm load? (stock in dash then aux auto meter gauge)
Laughing Gas
Joined: Sep 2003
Posts: 968
Likes: 5
From: Corbett, Oregon
It should work, if you install a switch (single pole, double throw) to allow you to use one sender at a time.
Your readings will not be accurate if you directly connect both gauges to one sender.
Roger Carter
Your readings will not be accurate if you directly connect both gauges to one sender.
Roger Carter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Haha for awhile the in dash gauge didn't always want to work right so figured I would get a new gauge (under dash) to use. But for whatever reason the idea of having to look at the gauge doing nothing in the dash is going to annoy me if I just use a aftermarket under dash gauge. So figured I would just hook both up if possible then it wouldn't annoy me.lol But never mind! 
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
If you really wanted to make this work, you'd need to use an electronic circuit consisting of a high-impedance buffer. Otherwise, the equivalent impedance of the two gauges in parallel would affect the voltage division between the gauges and the sending unit, altering the reading of both gauges. Not worth the trouble.
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SoCalAngler
1987 - 1996 F150 & Larger F-Series Trucks
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Jan 1, 2016 12:25 PM
