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Just a hunch, but it sounds like the same issue I had with my Firefly/Metro.
The gauge doesn't like being interrupted by the ign kill switch - it has to do with the communication protocol of your OBD-II.
To confirm: purposely stall the car (eg. dump the clutch in 5th gear at a crawl) at the top of a hill or something, where you can then release and keep rolling (with the engine off). My bet is the gauge stays active and keeps showing speed & mpg, etc.
If that happens, you just need to figure out a different way to wire your kill switch (spark or fuel, but not key circuit).
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