Just my 5 penneth.....
You will certainly need a voltage stabiliser if the instrument is designed to work that way. The theoretical 12v that comes from your car's electrical system is not actually 12v anyway, and also not particularly stable.
Using an electronic regulator may or may not work well - although a linear one is better than something fancier (digital). Car electrical systems are full of noise which plays havoc with anything electronic.
Personally I would try to stick with stuff specifically designed for the job. I would use the smiths regulator - even if you have to fix it the right way up!
Robin
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