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Sounds like the pin that the speedometer needle rests on at "0" got broken off. If you think you can take everything apart and fiddle some sort of improvisory repair for that pin, then jump in there and have at it. Note that needle calibration may be damaged and it will never read right again, regardless. Otherwise- new speedometer.
Since both gauges died at the same time, I would suspect either a connector issue with the dash cluster, or a signal issue from the computer. The RPM signal originates at the ignition and the speedo signal at the VSS. The likelyhood of those both dying at the same time is very slim. An easy way to check is to attach a scan tool and check in the computer for an RPM signal (running) and a VSS signal while driving.
As for the first problem it could be a speed sensor in the transmission. Do you have a check engine light on? You need to drive it with a scanner on it to check the speed sensor. If the sensor is reading fine but the speedo doesn't read right you likely need to replace the cluster. As for the second problem, this is a common one on the 4t65E trans. You need to replace the Transmission Pressure Control Solenoid.
a scanner that gets into the instrument cluster computer can reset the needles. or take the dash apart and manually turn dash cluster upsidedown, then the needles will move so rotate untill the needles are reset.
on rare ocasions the speedometer gauge cluster goes bad, but usually its the speed sensor. either the sensor it self or the connection either on the speed sensor or at the ecu. sometimes oil gets in and interupts in the electical connections. also make sure everything is fine in the fuse area.