All the diagrams were somehow too technical for me. The original article included only one variant of these digital volt- and ammeters. I will cover wiring for all of them in this post. These meters are good when you want to measure current and voltage at the same time.
How do I install a ampmeter on a lawn tractor?
How to Install a Car Volt Amp Gauge (with Pictures) - wikiHow
ammeter gauge how to wire an amp gauge in a vw bug
AMP gauges at the dash are troublesome. They should be by-passed, and then install a VOLT gauge. The antiquated AMP gauge system has reduced more Dodge owners to pedestrian status than any other kind! Chrysler Corp. With normal but frequent use, most of these Dodge trucks will have electrical wiring problems.
When you think about the number of sensors that your engine has, it seems like there is an endless amount of gauges that can be installed to monitor their readings. Some of these readings are important, but many of them are simple inputs to the vehicle's computer. The most common gauges on today's vehicles are the speedometer, tachometer, fuel gauge, and temperature gauge. Besides having these gauges, your car will have a number of warning lights that will illuminate if there are problems with those systems. One gauge that is missing in most vehicles is the charging, or voltage, gauge.