I am putting in a small panel of aux gauges, temp, oil pressure and volts. It was a rainy weekend and I decided to build a neatly organized little wiring harness for the panel of gauges that makes it easy to remove when I decide to replace the whole instrument bezel. I am more experienced working on watches than cars. My watchmaking training by the Swiss maniacs in Geneva preaches methodical perfection and planning. Here is a pic of what happens when a swiss trained watchmaker who is learning about cars from the internet builds a mini wiring harness for a gauge panel. It is assembled with soldered connectors, except for the suitcase taps that connect the power and ground wires into one. The harness terminates with sealed quick connect spade connectors to make it easy to remove. The lighting power leads are separate so that they can tap into dash lighting with clip on t-taps and spade connectors. Everything is shrink wrapped and the bundle is powerbraided. I intend to make the underhood wiring to the senders the same way with the spade connections all inside the firewall.
My question is this. Is it necessary (or adviseable) to attach the gauge ground wires to a source of engine ground under the hood near the sensors or can I ground them somewhere under the dash?
My question is this. Is it necessary (or adviseable) to attach the gauge ground wires to a source of engine ground under the hood near the sensors or can I ground them somewhere under the dash?