The only other supplier I could find for the PR33 digital Chronometric tacho was Kullen Instruments in USA.I checked the VOC spares site for several months, but the item remained on backorder. Finally I ordered from Kullen, who had 2 in stock ( but none now). The price at Kullen was little higher than at the Spares Co, roughly 10% as I recall.
The tach worked great for one week but is currently nonfunctioning. It appears that an internal lead has broken off, however I need to do some more testing. There were no replacement items available as of two weeks ago, so Tom Kullen suggested I do as much testing as possible to be sure the problem was not with my bike's wiring system.
He has been very helpful, however it would be nice is Smiths would back the product up by providing the dealers with some stock. It looks like this one needs to go back for repair or replacement.
Glen