Decals for hubcaps are ok. Here, a quick test with laser printed decals:
Same thing with seats just for fun, because colours are not definitive and result is ugly on the grey plastic:
And the choice of colours for dashboard & hubcaps.
Little and cheap sheets for silver, black and red decals.
Pink is varnish of the decal.
And a separate sheet for custom painting decals.
For them, I study a solution to make a white decal without varnish ( a kind of white varnish in fact).
First tests of painting decals works good with TS Paint.
It's not easy to do and requires some skills...Recommended to experienced modelers !
Soon I will do some test with Zero paint.