Take the top and bottom covers off of the control box. Remove the top two nuts on the back of the meter, and hardware, and the entire meter will slide out the bottom of the chassis. Do not unsolder the wires. The clear face pops off of the meter. Be careful not to damage the needle when you remove it. There are two screws at the bottom of the meter scale. Remove them and gently slide the scale out from under the needle.
Reverse this process for reassembly.
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