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If you post a photo of the console it would be helpful. Sometimes the consoles were molded units (no screws holding it together) and I've had to soak them in boiling water to soften them enough to pop out the gauges. Other times, I've removed writing plates from the back and found the attachment screws underneath. My 2psi
I would recommend really hot water, but not sure I (personally) would stick my gauges in water that was boiling. The heat could cause problems with any plastic in the gauges such as the compass. A few minutes soak in 80c (176f) to 90c (194f) water should work as well. The higher the temp the more potential for damage.
It should also be known that some gauges, such as depth meters are oil-filled with a diaphragm for the back of the gauge. Care must be taken when removing/replacing these as the diaphragm can be easily torn...you will know because the oil will leak out (don't ask how I know).
-Z