Not all of them have the voltage regulator built into the fuel gauge. In fact, most of them do not. Meter match is running a standard 7805 regulator and wont power more than one gauge. So, you need another regulator if you want to use the oem temp gauge.
Have you even installed a meter match before? What I said is not "difficult and pointless", in order to use the meter match it runs off its own regulator.
I dont use 50 year old regulators, I install my own additional 7805 on a heatsink along with the meter match. Much safer than risking the bi-metal type and having the contacts stick closed and frying the gauges. Although in 30 years of owning mopars I have only had them go open, I know its a possibility for them to hang closed. --
