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remove the speedometer then remove the screws on the back of the speedo, this should give you access to lights :)
Remove the dashboard cover. Remove the retaining ring, from the speedometer. Remove the speedometer cable from the back of the speedometer. Reverse the process to install the new speedometer.
1980 corvette , how to remove speedometer
Remove the dash panel cover. Remove the speedometer retaining ring. Remove the cable from the back of the speedometer. Reverse the process to install the new speedometer.
Most probable cause is the drive cable between gearbox and speedo has broken.
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You will need to remove the instrument panel cover. Remove the retaining screws from the speedometer. The lightbulb will be on the back of the speedometer.
Remove bottom hose
remove cable from the transmission and remove the cable from the back of the speedometer up under the dash and then the complete cable can be pulled out.
U HAVE TO REMOVE THE SPEEDOMETER FACE PLATE, AND REMOVE THE SPEEDOMETER AND THERE ARE ALL THE LIGHTS ON THE BACK PART OF THE SPEEDOMETER, PD:BE CAREFULL WHEN REMOVING THE SPEEDOMETER THERE IS A SPPEDO CABLE UNDER NEED U HAVE TO DISCONECT THE CABLE FROM BEHIND.
It has been awhile for me but I don't think you can remove it. The speedometer is a press fit and has to be pushed out from behind.
Drink it