If its the speedo, gauges panel just very gently pull it. It fits into 3 of 4 push in fittings. Just be very gentle. All the gauges etc remain in place just the wood facia comes away ,
Most are as Karl says, but some had the venner attached onto a metal backing plate which is bolted through the dash so check and then double check before you start as you can brake the venner very easly!
It does feel bolted in at certain points, I actually want the walnut to come off as I'm recovering in leather. If it is bolted, do you know how I access the bolts?