Instrument voltage limiter

This what I recommend, its output is 5 volts NOT 6 volts. My research says to use a 5 volt on Mopar's.
12v to 5v Volt Converter, DROK DC Voltage Regulator Board Power Supply Module, DC 6.3-22V 12 Volt to 5 Volt 3A 15W Waterproof Car Volt Step Down Buck Converter. Over-current protection; over-temp protection; input reverse connection protection; short-circuit protection; waterproof; dust-proof; moisture-proof; shock-proof. $12.59

Real time engineering wants $50.00 !!

https://www.amazon.com/gp/product/B07P663XJV/?tag=fabo03-20
The OEM mechanical limiter would put out more juice at switch on so the gauge needles would climb faster. The Real Time Engineering unit was designed to mimic the mechanical gauge voltage limiters operation. Less expensive universal regulators do work if slow gauges dont bother you.