How can I get my gauges to work (EFI to Carb)

Discussion in '94-95 5.0 - Specific' started by red9535, Jul 21, 2007.

  1. red9535

    red9535 Member

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    I bought a 95 Mustang that origionally had a 3.8 EFI V6 in it.. but the guy swapped a carb'd 5.0 HO V8 into it. Well, the gauges don't work (except for the voltmeter and I believe the gas gauge?).. Where do those gauges read off of? Did tehy go through the PCM.. and in that case, how do I get them to work.. and if they didn't.. waht do they read off of? Because the car didn't have any of the trans sensors connected when I got it.. would that be the speedometer/RPM?

    Help!
     
  2. red9535

    red9535 Member

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    Trans is AOD, engine is from a 93..
     
  3. 95PGTTech

    95PGTTech Well-Known Member

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    I would get a carb cluster and wire it how the carb'd car would have originally come, because even if you can wire the sensors to the cluster, it's likely they will read wrong (different sensor outputs, ranges, voltages, resistances, you get the point).

    for example, the engine temp gauge on a carb'd cluster might be looking for a 10ohm-100ohm resistance output from the coolant temp sensor, while a fuel injected cluster might be set up to read a 1ohm - 10ohm sensor output. So you'd wire the sensor into the wrong cluster and it would be constantly pinged on hot for example.

    You could also take the sensors off a fuel injected motor, hope they work or make them work (adapters if different thread pitches, etc.), and wire them to the cluster yourself, but that would take quite a bit of understanding of how the systems work, some large balls, and a huge pain in the ass.

    or you could just buy a whole set of autometer gauges, make/buy an instrument panel, and wire them up as per instructions.

    or you could just convert it to fuel injection and save yourself a lot of time and money. O0
     
  4. Paul

    Paul Legend

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    :dance: :bunny3: :boink:
     
  5. red9535

    red9535 Member

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    I've strongly considered it.. but I think i'll be sticking to carb, for now :)

    Just trying to get my cluster working!
     
  6. The Green GT

    The Green GT Active Member

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    You wont regret going to FI.

    And like Ive said, it wont be nearly as hard as you think.