Hi, I would like to change my sierra type speedo for individual clocks, preferably smiths, my hood is a 2L with 5 speed gearbox, what do I have to look out for? I have seen an mgb speedo on ebay, looks good, but will it work? Also just a thought, how do I stand legally, if I buy a secondhand with lower mileage than my original, is this classed as ' clocking ' the speedo? just a thought.