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will my fuel gauge work without PCM?

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Old 05-28-2007, 04:39 PM
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will my fuel gauge work without PCM?

just wondering....don't have a PCM anymore
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Old 05-28-2007, 06:54 PM
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The PCM has nothing to do with the fuel gauge AFAIK.
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Old 05-28-2007, 06:58 PM
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o.k.

What else will work? nothing?


water, amp, oil? If not then I need to order some gauges asap
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Old 05-28-2007, 09:10 PM
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Only the tach and the speedo are driven by the stock PCM. Both can be connected without the PCM. Coolant, system volts and oil pressure are direct wired from sensors, not the PCM.
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Old 05-28-2007, 09:17 PM
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so fred I have an old harness.......I can just find the wires and plugs I need and hook up the other gauges? If so that would be good for now, I don't need the tach or speedo


Thanks for the help guys
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Old 10-30-2007, 06:52 PM
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shoebox hope you can help me again....

What did I need to do in order to make the stock alt. work? I know you said wire a resistor to a switched 12v but how much was it?

If anyone can help thanks
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Old 03-10-2018, 02:28 PM
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Re: will my fuel gauge work without PCM?

Originally Posted by shoebox View Post
The PCM has nothing to do with the fuel gauge AFAIK.
new sending unit Gage won't work no pcm can play
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Old 03-10-2018, 02:38 PM
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Re: will my fuel gauge work without PCM?

Originally Posted by Villin View Post
new sending unit Gage won't work no pcm can play
Could you provide basic info, like the year of the car? Could affect the answer. And not sure what "no pcm can play" means.

In the meantime, if it's a 93-97, read this:

Courtesy of Shoebox

4th Gen LT1 F-body Tech Articles
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Old 03-10-2018, 08:57 PM
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Re: will my fuel gauge work without PCM?

I have a 98 Camaro with stand alone pcm and harness no factory pcm will my gas Gage work
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Old 03-11-2018, 12:41 PM
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Re: will my fuel gauge work without PCM?

Originally Posted by Villin View Post
I have a 98 Camaro with stand alone pcm and harness no factory pcm will my gas Gage work
NO

This is why we need to know the basic info. Up through 1997 the level sensor is wired directly to the fuel level gauge. In 1998 they changed the setup, and the level sensor signal requires the PCM to interface with the fuel level gauge. Generally, it makes sense to keep the stock PCM (in addition to the aftermarket ECU) for functions like the speedometer, tachometer, and starting in 1998 the fuel level gauge.
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