Lugnuts Garage | How To Test Mopar Gauge's & Build An Old School Tester. 

Built an old school Mopar gauge tester while finishing up Matt 70 Plymouth Duster project.
With the exception of the box we purchased it on Amazon.
L = 73.7 Ohms (empty)
M = 23.0 Ohms (1/2)
H = 10.2 Ohms (full
1- Changeover Switch www.amazon.com...
2- Resistor Kit www.amazon.com...
3- Regulator- DC 12v to 5v www.amazon.com...
4- AC to 12V DC Power Supply www.amazon.com...