Not sure what is going on with the SG but to clear codes you can also disconnect the battery for at least 20 seconds. The computer will have to run through all the readiness monitors again but the code will be gone.
Maybe email linear logic to see if they have ideas on why the gauge isn't performing properly.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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