What an amazing bit of kit...! This is probably the best money I've spent on my 1965 Sprint so far. All the functions work as they should. I went out and checked the speed against my Sat Nav and it is spot on.
There are a couple of minor points to note however.
Firstly, the temperature sensor rings will not fit under the spark plug without drilling a space in the cylinder head. This isn't exactly difficult but an easier option is to attach the ring to the bolt that secures the head cowling. The readings will be slightly different but not by too much and the point of it really, is to notice drastic rises in temperature.
Secondly, the long lead won't fit down the steering column as the connector blocks are too big to get in the holes. This is only necessary if you want to connect to the battery -if you have one- under the panel. I've got an electric start so connected to the positive wire of the push button. This means I can have the speedo on without starting the engine and doesn't piss off the neighbours when inputting data into the unit...! This can take a while as the instructions are a bit confusing but you only have to do it once.
I would highly recommend this product.