Basic Loom Qs (12v source)

[Tom]

I'm currently putting my VEMS loom together, just wanted to check my plans were ok:
Rather than use the standard 12v switched supply for everything, I'm thinking about putting a relay in to control a fresh 12v line which I'll use for the VEMS and all sensors / injectors etc...
Are there any parts that I should be supplying with a permanent 12v rather than the switched?

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I can see nothing that needs a constant feed apart from a single main relay, you could do worse than copy how the VEMS harness has things setup:

[Tom]

Very useful. Thanks for that Rob.