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You need to calibrate the SG unit. I have an ultragauge, but I'm sure it is simple. Someone with an SG will chime in. It's just a matter of calibration. Yes, the 9999 is an indicator of deceleration fuel cutoff mode kicking in.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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