I use Zaino leather in a bottle for my dash. It's an ABS textured plastic dash that I wouldn't trust many products on. I tried Z10 cause they said you can use it on these types of dashes and because Z10 leaves a matt finish. It turned out great, nice and even matt shine, after you wipe it with a MF. I did apply a second coat more so it would last long. The dash darkened up a bit, I could really tell the difference when I was outside looking in. The dash is dark gray on one side and light gray on the other, and the very light matt shine brought them together nicely. On my old Bronco I prefered a shiney protectant like armorall, because that dash was smooth, but on these new types of hard to figure out dashes with funny textures I really like Z10. A bonus is that my car smells great too, and the finish is not oily at all.
I would use something on the dash to prevent cracking. I had my bronco since 93 and I sold it in 04 and the dash looked brand new, just by using armorall about every 3 months, more in summer. I took good care of a my bronco, I bought it off the showroom floor for $21,500 and sold it for $9600 over 10 years later. Most 93 Broncos sell for around 5,000, it pays to protect your cars looks, Dash, Paint, windows, trim, etc.