I have a 73 series 3 SWB and the dash (speedo, gauges and switches) has seen better days plus the previous owner has changed the switches for after market ones.
I have looked around and on auction sites and new ones are a fortune, switches are really expensive.
On auction sites the dash units go for about £40-£45. That's the plastic front with speedo, fuel gauge & switches.
However series 2/2A centre style dash facias go for a lot less.

My question is, how easy is it if at all to move all the wires and fit a centre Series 2 style dash into my Series 3?

a bloody lot of work mate fer a start the series 2a bulkhead has a metal shelf both upper and lower welded onto the bulkhead but the series 3 is all bolted to the bulkhead it could be possible to do this into a series 3 but would be higher up than a genuine series 2

you could however try retro fitting the series 2 pannel in place of the series 3 one ( behind the steering wheel ) saving a lot of time and effort

just be damn carefull and gentle removeing the speedo cable as theyre brittle and a twot to get at give yourself as much slack as you can from inside the engine bay before attempting disconecting the cable

Cheers,

Not thought of that as an option. Speedo cables knackered already. I've got a new able.