Building or buying an IVR / step down voltage buck converter for the instruments

I didn't convert the gauge itself, but disconnected it and left the amp gauge in place. Added Autometer triple gauges under dash(oil psi, coolant temp and voltmeter). I like the looks of oem gauges, but didn't trust the remaining life and accuracy of those gauges.
You converted ammeter to voltmeter? It’s a slippery slope :)

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