Wiring 2 EGT probes to 1 gauge ??? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 04-29-2009, 11:28 AM Thread Starter
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Wiring 2 EGT probes to 1 gauge ???

I bought my truck with a autometer pyro with the EGT probe in the downpipe. The previous owner welded the bung onto the downpipe, and now the probe doesnt want to come out.

Option 1)
I could just not use that probe, since its stuck in there, and I have a new probe to put in the manifold.

Option 2) I could somehow wire the two different probes to a switch, and use the same gauge. I could switch from manifold pyro to downpipe pyro when i want to.

I dont want to buy another gauge as it takes up more space and costs more money. I would liek to do option 2.

Has anyone had any experience wiring up two probes to 1 gauge? Autometer is no help as they say that the voltage between the red and yellow wire is so small that adding a switch and another prob will distort that number and cause the gauge to be inaccurate. I have a feeling this is possible. Help please.

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post #2 of 5 Old 04-29-2009, 11:32 AM
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Ask Jake. He would know the best.

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post #3 of 5 Old 04-29-2009, 12:17 PM
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Auto meter is right. Any resistance to such a small voltage will distort the reading. A switch would cause resistance.

Youre best bet is to either leave it there and not use it or cut the bung off and weld the hole shut and not use it. Or you could leave it till you buy another guage.


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post #4 of 5 Old 04-29-2009, 12:19 PM
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I think that stewart warner makes a dual sweep pyro...

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post #5 of 5 Old 04-29-2009, 12:28 PM
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You cant do it, it will change the reading on the gauge. You can just order a new probe and install it to your old gauge.

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