i have a small, cheap backlight analog voltmeter mounted under the dash on the right side. it's wired behind the console and spliced into the power that goes to the radio. you could wire it into the cigar lighter as well.anything else might be needlessly complicated (in terms of going through the firewall, etc)

from my reading of the description for that piece, you'd only need the shunt if the input amps were over 100?

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1981 NA 300D 310k miles