I'm using a red cube with the GRT EIS 4000, but you have to have the fuel flow function on your EIS, which they charge for. If your EIS has this feature turned on, then you're good to go. If not, you'll have to send the EIS back to GRAt to turn it on. Either way, it's worth it. I put fuel flow at the top of my list of options in any plane.
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Jesse Saint
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