Re: Mechanical vs. electrical gauges
I used both and like mechanical gauges myself, they don't require electrical power.
Mechanical temperature gauges are Bourdon tube variety and come equipped with fitting and sensor all ready made, more like it is one piece, so you need a large firewall hole for the fitting.
The only problem with a mechancial temp gauge, once the needle is pegged, meter needs replacing.
As Jeff states, there is no coolant in the interior, it is enclosed with another inert fluid.
However, electrical gauges are easy to use and hook up. Just make sure the body of the sensor has a good ground to the block/head/manifold.
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