| As a last resort, if none of the fixes worked, you can purchase a simple and cheap universal DC 12V clock and make it fit inside the original housing. In the example below I used a cheap clock / thermo & voltmeter combo from Aliexpress (LINK) 
For those that have a 3D printer, you can use this STL to fit the chinese clock's circuitboard inside the original 300ZX clock housing. 
You will have to modify (shorten) the switches on the board a little.
That way it'll fit nicely and you will still be able to use the H/M buttons of the original clock to adjust the new clock You can re-use the original connector of the clock as well if you want.
From the original clock's connector use the black wire for ground and blue wire for (switched) 12V.
(These little clocks have a built-in battery, so there's no need for a constant live 12V ) END RESULT: current time:
 battery voltage:
 temperature:
 ...this particular model clock has 2 seperate temperature sensors that you can use for several options, eg. ambient or outside temperature, coolant temperature, oil temperature, etc.
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