I done it on my gauges. Its an easy job. Just make sure you put the resistor on the correct wire or you will damage the gauge. Its also worth changing the polarity to a negative earth so you can add electricals like stereo. Take lots of photos of the back of the gauges with a mobile before you disconnect any of the wires. It can get confusing if you have to connect it up again a week later.
I.ve fitted a new wiring loom as the truck was upgrade to 12v and neg earth but was a mess ,the gauges in the truck were 12v auto meter gauges when i bought it ,but i've swapped back to the old gauges .
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