I used a cover from IPD over mine. Any other repair technique that I've seen (and I've seen quite a few attempted) leaves you with a repaired crack that looks repaired. Which begs the question - does the crack or the look of the repair bother you more? Here's one approach - https://rubnrestore.com/how-to/repair-cracked-dash/ Do a search - there are TONS of videos and resources out there.
There are companies out there that restore them -- but the dash has to come out AND be sent off. It's pricey. And not unlikely that while removing the dash, you'll break some other plastic bits.
Here's the kicker - once the cracks start, they are likely to show up in other places on the dash. So you repair one -- and then another rears it's head. That's why I prefer the covers. Pics below of mine with and without the cover.


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