I like to use signs on my fluid and gas tanks. Right now I using warning signs and I think its very good idea how this signs working, but I really try to find something similar to factorioo
(angels mod) marks, something like this 3 colors sign looks like drop on Factorioo machines.
So here my sugestion… if any chance to add to GT6 simple sign with 3 parts (similar to this in Factorioo) when we can use color sprays, diffirent for any part of this sign. This give us chance for using difirent signs for every fluid in game just using one sign with difirent collors.
I always prefering visual marks (colors, signs) than text marks (labels), and its should looks very cool