anyone know details on the signal for the fuel level gauge? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-31-2011, 02:19 PM   #1
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Default anyone know details on the signal for the fuel level gauge?

I'm trying to determine if there's a way to incorporate fuel level into a PLX gauge.
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Old 04-02-2011, 04:37 AM   #2
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I don't know how the measurement is made, but if the car is pointed up hill the gauge reads 'fuller' than when flat, and in turn when the car is pointed downhill the gauge reads 'closer to empty'. Also, there is a large amount of damping in the system somewhere. I o not know if the damping is in the gauges, or at the sensor.
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Old 04-02-2011, 11:47 AM   #3
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I tried to do a fuel gauge with my digital dash but it didn't work out. Configured as a simple voltage divider the signal is not stable. I am not sure why but I'm guessing that it may need more voltage through the wiper contacts due to varnish, etc. I have a spare fuel sender that I have been meaning to play around with but haven't had time yet.
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Old 04-02-2011, 12:18 PM   #4
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Any chance I can pull the gauge out of the cluster and incorporate it into the cluster I'm thinking about building with VEI gauges?
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Old 04-02-2011, 06:14 PM   #5
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The damping action of the fuel gauge is in the gauge itself. The other gauges turn quite freely when moved by hand, the fuel gauge has a noticeably stiffer sweep to it. Hustler, Moving the fuel gauge to another setup would require removing 3 screws at the back of the instrument cluster. It simply pops out after that. Those 3 screws also function as the inputs to the gauge. One input is ground, one input is ignition, and one input is signal. You should be able to very easily track down which wires those signals come from in a matter of mere seconds (they are all labeled on the back of the cluster!), and then you could splice into those wires and run them to your gauge. You could have a perfectly working fuel gauge held in your hand in about 15 minutes flat. I've been taking the gauges apart in the gauge cluster of my parts car trying to game plan a PLX install; my intention is to simply remove the oil pressure and water temp sensors to install two DM-100 gauges. The gauge holes may have to be widened by mere millimeters to make it all work. If I could find a way to get fuel level onto a PLX gauge, I could take the fuel level gauge out and put a 3rd gauge in. I could monitor some of the less critical variables in 4-up displays with alarms (oil pressure, oil temp, water temp, fuel level, etc.), and something more important (like AFR) in the slot where oil pressure occupies as a 1-up display. This would allow me to detect what is going on real time with AFR, as well as the other variables, and if any of the variables went out of range, I would immediately get a "LOOK AT ME ************" alarm.
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