Thanks both for the input on the float gauge. Also handy to know what that other tank is.
I thought from the pictures found online that it was glass with printed lines/text.
Which would be easy enough to do with a transmap, but I find transmaps really hike render times, so I try to avoid them where possible.
I also think that modelled detail kicks the rear of transmaps and textures.
However theres a pay off there in a higher polycount.
Especially if that modelling involves any form of text.
Fine for stuff that needs it, or is really obvious, so not good for a tiny part.
So then I'll try and pseudo-model parts, to give the illusion of something being there.
Which, in this instance hasn't quite worked. So I've rejigged that slightly, turning the disc's into rings. Yes it's not perfect, but I think a nice balance.
I also know what you mean about old "tech"
My grandparents place was wood fires, with a large cooper bowl for heating water and power courtesy of the Canadian army. An army that left a truck behind after WW2, so my grandad jacked the truck up onto blokes and removed the tires and rear body.
Leaving the chassis, engine and cab. A large belt ran to the back wheels, which turned some form of generator. Another bonus came by opening the shed doors and connecting another belt to something like a wheat threshing machine.
Something that gave Health and Safety kittens back then