Speedometer for a special (on a budget). Ideas?

[Michael D]

when considering using a speedo being cable driven from the 'box you'd not only need to have the 'right' final diff ratio to go with that box and speedo-drive; you'd also need to fit the right (i.e. 'correct') size of wheels + tyres. Personally I'd advice against all sorts of contraptions that need to be fixed by silly wires as that's all not very dependable... working out re-calibration also requires some skills to reface the dial... and I do not suppose your godson actually aspires driving something that would make him the laughing stock at the first event he enters even though it's 'his' special and he is doing things 'his way' regardless of what other people think... So try to get a (the) speedo that can be driven from the box and fit the correct diff and types ... why make life more difficult and spend money on a 'solution' that is actually not a solution but more hassle ?