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the system (bags) needs speedo input.
so fix the speed first
ever scan it, ; plug in any scan tool and look for all those errors called
DTCs , bingo.! then look them up in the FSM?
bam.
the odometer gets it drive signal from the spedometer so if the spedometer is working then the only thing that can be wrong is the drive circuit from the spedometer to the odometer, the only thing you can do is replace the spedometer assembly, and now the bad news the spedometer on this car has its own computer that has to be programed to match with the other computers on the car so if you get a used or new unit you will have to take the car to GM and have the computer flashed so that it will work with all the other computers on the car.....good luck
check battery volts should be 12.6 volts. alternator faulty.check under hood see if alternator drive belt tight not too loose.with engine running alternator out put at battery should be 13.5 - 14 .5 volts.
if its a manual speedo then it needs changing ,the magnet /spring inside is either worn or dirty inside the unit causing it to drag.as for the engine check light ??? well i do feel you are wasting you hard earnt cash on this stuff i think it is no more than a split in on of the little vacumn tubes running off the inlet manifold to various things .Make sure this vehicle has a 88ºC thermostat fitted and when you have a cold engine drive straight off and dont warm it up`because you are causing more damage to it running it to warm it up .Starting off from cold will cause it to warm up quicker causing less engine wear.The sluggish gearchanges ?? well how old is it and dont you think the gearbox is a bit worn after all this time like us when we get old .
Pull trim panel off around cluster, remove screws holding cluster in, unplug harness from rear of cluster, and remove cluster. Now with tweezers, or needle nose pliers, slightly twist or bend, ends of spade pins in cluster, where it mates with connector to allow for better contact with harness connector. Spray electrical, or contact cleaner in connector & on cluster pins before re-assembly. re-install & make sure connector tight to cluster. Not real difficult, you'll be fine. let me know how you make out.
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