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Old 05-30-2014, 06:40 PM   #1
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Air Pressure Gauge on Dash

My air pressure gauge on the dash of my 2000 Safari Serengeti doesn't move. It's maxed out at over 150 psi. Do you know if there is something I can do besides replace the gauge.
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Old 05-30-2014, 06:44 PM   #2
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The gauge is possibly electronic so I guess it could be faulty elsewhere but the gauge itself.

Do you have two gauges? If so you could swap the feeds over and see if the fault moves to the other gauge.
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Old 05-30-2014, 08:32 PM   #3
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Scratching my head...
How would that gauge read if the wire at the sending unit were disconnected? Or if the wire to the sending unit were cut?
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Old 01-03-2015, 09:20 PM   #4
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Johnnie,


Did you ever resolve your issue, if so what did it turn out to be?
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Old 01-04-2015, 02:29 PM   #5
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I do agree with Tony Lee if you have two gauges. Swap and see if the problem follows the gauge. Depending how the gauge works will give different readings if wires are disconnected or shorted as some work off a balance circuit using 3 fixed ohm resistors on one variable. One type will give full needle deflection when shorted to ground and no movement if the circuit is open.


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Old 01-05-2015, 10:09 AM   #6
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I haven't resolved the gauge problem. I do have a place at the rear of my coach where I hook my air hose when I air up tires etc. I have been able to check the air pressure at that point periodically with a hand held gauge.
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Old 01-05-2015, 10:12 AM   #7
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Johnie, thanks.. my problem mysteriously corrected itself! Love it if it will stay corrected. If you find it to be the guage itself, I saw a new one on eBay this weekend for less than $30


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Old 01-05-2015, 10:26 AM   #8
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The answer to my previous question, regarding the reading you would get if the wire to the sending unit were cut/an incomplete circuit, is the reading the OP first described. The gauge will go off scale to the right....

If the sending unit wire becomes grounded, just the opposite will occur, with the gauge reading on it's low side.

Gas, oil pressure, etc. most electric gauges work the same way. The easiest way to test them and their associated wiring, especially if you have easy access to the sending unit, is to remove the wire from the sending unit. This should send the gauge to the right. While it's removed, install a jumper from the sending unit wire to ground. That should send the qauge to the "empty" or left side. If those test as expected, safe bet your issue is the sending unit...

If they don't check as expected, you can make the same tests on the back of the gauge itself to determine if the problem is the gauge, or the wires leading to it.
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Old 01-07-2015, 11:50 PM   #9
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Those are Stewart Warner sending unit. 56 bucks at Summitt racing in Reno. Check it out online. I've replaced 2 of them.
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