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Hey guys any info on this would be greatly appreciated. On a 2006 GMC Sierra 1500 Z71 with the 5.3, recently both the fuel gauge and oil pressure gauge started going to empty (with the low fuel warning light) and zero respectively after start up. This happens after engine starts and running for about 5 seconds, then both gauges will peg to the left for about 3-4 seconds, the 'Security' icon lights up and a chime sounds off. After that oil pressure and fuel gauges return to normal. Oil pressure holding around 40 at idle. fuel gauge has pegged to empty at least twice while making turns.
Thanks.
 

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Sounds like a loose or broken ground wire.
 
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