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RacePak dash and fuel gauge ?

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 Although it doesn't look like anyone is using a Race Pak dash I'd like to propose the following ;


 I've been told that some SM racers with digital dash's use the OEM Miata fuel gauge


 Any issue's with installation ?


 From the wiring diagram it appears to be 12v+ and a ground to the gauge with a 3rd wire from the sending unit 


 Are there connections on the back of the gauge ?


 I'd rather like to stay away from configuring the Race Pak for the fuel gauge as, from the 100pg manual, it looks complicated




Robert Dudek

Jeff Wasilko

Jeff Wasilko


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I've worked with RacePak (both a G2x and IQ3). They're a little challenging. I've since moved to AiM MXL/MXL2 and am much happier with it.


Your best bet is to use the Iron Canyon fuel sensor adapter. It'll convert the resistance-based sensor to a 0-5V input. You'll need a USM to be able to accept the sensor (it'll take 4 inputs):




For the Iron Canyon box, you'll need to drain the tank and gather calibration data for best performance. This will give you a map of voltage to gallons. Start with an empty tank, add a gallon, and note the voltage from the Iron Canyon box. Continue, adding a gallon at a time until full.


With that table, you can easily set up the sensor in the IQ3 software.

Tom Hampton

Tom Hampton

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I have a G2X, and totally agree with Jeff.  The stock fuel sensor is an inverse resistance relationship with fuel.  This "CAN" be interfaced to a USM directly, but it would be a pain to calibrate.  Much easier to go the route suggested by Jeff and use the Iron Canyon box to convert the inverse-resistance to a linear voltage, and then measure that with a USM.


I like using the USM for most everything.  Generally, it is the most economical way to interface sensors into the Racepak systems.  I use Stack ProStepper gauges that include a 0-5V output, which I can directly wire to a USM.  So, for $50 per channel, I can record any gage. The AEM wideband also has a 0-5V output.   The USM can also be connected to standard sending units, switches, etc. 


The alternative, single dedicated sensor modules generally run $100-$200 per channel. 

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