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did you do a car to car jump or a portable jumper box? on cadillacs you shouldn't do car to car jumps do to there's a chance it'll mess up you computer system. vonshay_m2002@yahoo.com
On my 1987 Fleetwood, there is a button on the dashboard labeled E/M. Pushing this button changes the readings from English to metric and back. Hopefully there is a similar button on your vehicle.
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
If all the gauges in the clustor are working and only the speedometer is not, I suspect the Vehicle Speed Sensor which is located in the transaxle. Easy to replace and only about $15. http://www.partstrain.com/ShopByDepartment/Speed_Sensor/CADILLAC/SEVILLE/1999
Lose of power or ground since all the gauges quit working.
They are probably not working because they are most likely broken.
Is it all the gauges or some? You make have to take the instrumental cluster apart. Make sure all the hardness for the gauges are all connected.
my 1998 doge ram van, all my gauges are not working
check your fuses first
check the ground sprats
#4 fuse blew
because it's old, stupid