What is the difference between direct reading gauges and electric gauges?
Mechanical gauge puts hot coolant thru your firewall and into the cab with you. Great if they never leak or break. If they do (and they can) burst/leak, you now have very hot and toxic fluid spewing into you cab. I've seen it enough times to only run electrical gauges for coolant temp, fuel pressure, and oil pressure. Sure you can buy an "isolator" for them, but that adds significant cost and another point for failure.
Heath
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