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egr- exhaust gas regulator, so look to exhaust area
gas guage and speedo might be two separate faults, or same, usually if speedo fails, needs to be replaced
Take your truck to a GM dealer and have the Body Control Module checked. The bcm controls most electrical and display functions inside of your vehicle.
That smoke came from some wires that shorted and melted. Take the car immediately to a shop and fix the wiring loom, it can burst into flames at any minute now.
From 2003 to 2006 GM - chevy , pontiac , buick , cadillac , had bad step motors inside the instrument clusters , causing gauges to no work or sporadically . Happened to my 2005 chevy cavalier , went to automotive salvage yard ,got a used one for $20.00 buck's . That was two year's ago , now problems ! How to repair GM Instrument Cluster Speedometer Gauge Stepper
Or you can buy the up graded stepper motors on eBay an fix it .
check the cable for the speedometer at the interconect. the cable is loose somewhere along the length of the cable. one back of he meter, 2, interconnect. 3, transmission case.
make sure the inner cable is square not rounded. if os, you need a new cable.
You better check the connector to the speedo and cluster, either you bent a pin or damaged the printed circuit, or the connector is not locked properly.
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