On my Esc Cos I have 3 Defi Gauges running off a controller and an SPA digital gauge. Currently it seems they are all bridged off the stereo wires, so Im looking to make my own loom for them and run it directly of 2nd ignition. Does anyone know what I will need to use, i.e. a relay, fuse or anything?

If possible could someone draw me a wiring diagram for it? Im ok at wiring, but dont wanna wire it all up dangerously and Ive never created my own loom before, so any help is very much appreciated