Lexol Vinylex is made specifically for auto interiors. Comes in a spray (spray on a cloth and wipe on, never spray directly on the vinyl) or a handy pop-up wipe. I have both at a super low price, with 5% more off for 300forum members.
Has a UV protectant to slow sun deterioration (nothing stops it totally, all modern vinlyl has UV resistant treatment, but that goes away over the years).
Provides a heathy look, but not a high shine, which is not good on dashboards.
If whatever treatment you use is too shiny, then just wipe down with a damp cloth (water) and that should cut the effect.