I have a temperature sensor, a button, and a number.
I want the number to normally show the temperature, but when the button is pressed down, I want it to show 99.
I can figure out how to make the button make it show 0 (power-button-invertor-temp-number). I can figure out how to make the button show a number over 50 when it's pressed and have the temperature divided by two when it's not (using a mix). I can't figure out how to leave the temperature signal intact except when the button is pressed and when it's pressed to force the signal to 99.