I now have a 0-80 and a 0-100 speedometer both reconditioned, tested and with a 10 & 12 month warranty from a UK speedo restoration firm that advertises in Old Bike Mart. I believe the 0-100 speedo was introduced on later Arrow SS,s and is quite hard to find.
My dilemma is which one to keep and which one to sell. My Arrow SS is not restored to original spec so either is OK for me. They both cost £100 to restore so should sell one. Terry Langley.