That's fine and all if you have the space for another 2 1/4" hole, and you have the ability to cut a perfect hole cuz that's not as easy as it sounds. Also, those clocks are US$ 160.00 on Aircraft Spruce USA, plus shipping. I usually just use one of these smaller rectangular clocks, which also double as both a Voltmeter and OAT. Less than A$10 delivered ex China. I usually buy two at a time in case of failure - for the money, why wouldn't you. Below are the details, and the buying link. Car Electric Clock Vehicle Digital Timer Luminous LED Clock Thermometer Voltmeter LED Display Digital Clock Blue Green Red Light-in Volt Meters from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
Description:
Length: 40.2mm, width = 12.8mm, thick = 14mm
Display color: Blue, Green, Red
Display mode:
1. display time only
2. display temperature only
3. display only voltage
4. time temperature voltage alternating display (Note: under alternate display mode, through dd option to choose whether to display the temperature or voltage, dd:0 displays time + temperature + voltage. dd:1 displays time + voltage. dd:2 displays time + temperature)
Features:
1. Set the time, temperature, voltage, three functions in one
2. manual error correction function with a temperature setting range -5 Celsius ~ 5 Celsius
3. With backup battery, power-down time to continue to go
4. 24hours
Electrical Characteristics:
1. Input voltage 7 ~ 20V. Note that when using as a voltmeter, the input voltage is at least more than 7V.
2. Voltmeter range 7 ~ 20V, error ± 0.1V, the measured voltage is the input voltage.
3. Temperature measurement ranges from -50 to 130 Celsius
4. Working current is about 30MA.