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The gauges in the instrument cluster are driven by stepper motors, sometimes these motors go bad. More than likely your tachometer problem is caused by a bad stepper motor. If you are handy, the instrument cluster can be removed and sent out to a repair center. Check on Ebay for repair persons.
It's tach, not tack, short for tachometer. Were these gauges installed by unionized people? It could have been the gauges' day off, as per their collective agreement. Most instrument panel woes are caused by bad grounds. Most panels are below the front glass, and if this leaks, guess where the water goes? Dashboard problems are a bear to fix sometimes, and costly in terms of labor. Have someone steal the car.
I can't understand how the bad cluster would prevent you from fueling. The instrument cluster can be repaired. Look up specmo.com . I had mine repaired there. Quick turnaround. Previous to using Specmo, I tried Two parts from salvage yard and both turned out to be bad. Dealer wanted about $500 to do the repair. I did removal and install, Specmo repaired my cluster for around $125.
What has happened is your speedometer and tachometer drive motors are failing inside your silverado instrument cluster. I see this very often in GM trucks, to fix the problem you need to have your instrument cluster rebuilt.
hate to say it, but it's basically the instrument cluster was built rather cheaply -- I've switched mine for one with a tachometer as I've got a manual transmission, [it's a fairly quiet car and with the radio on at all and windows up it's hard to tell how high it's revving] and mine does this all the time, I get every other digit, and if I need the actual miles I have to fiddle with the trip meter button a bit for it to show properly Basically, you can try and get another instrument cluster and swap it out or just deal with it -- I don't recommend trying to 'fix' it as most often during the disassembly of the cluster damages the gauges
Your Speedometer Needle is driven by a "Stepper Motor" which is an Electronic Device. There are many GM Vehicles that were factory equipped with these and some if not most have already gone bad. Most reputable Speedometer Repair facilities can repair it for you. You might also check with a Chevrolet Dealer. If the vehicle has LOW MILEAGE it may still be covered under warranty. The entire Instrument Cluster must be removed and disassembled to gain access and replace the Stepper Motor(s). I would strongly suggest having ALL of them replaced when you have it fixed. These are Fuel Gauge, Temperature Gauge, Oil Pressure Gauge, Tachometer and Volt Meter in addition to the Speedometer.
This is most likely not a speed sensor problem, I see this a lot on 03-05 Cavalier instrument clusters and it's always the same. It's caused by failing stepper motors on the cluster's circuit board and it can be fixed. Check out this page for more about how to get it fixed - cavalier speedometer fix