Ive got a series speedo being run by a rangie autobox, with rangie diffs and 33" tyres. Quite understandibly its a very long way out - at least 30%.

Anything I can do to correct this? Tip-ex on the dial is the favourite at the mo (mainly cos its the cheapest).

Try changing the speedo drive gear for a 110 item frc3310 used with 7.50 & 235/85 & 255/85 tyres.

Have you tested it with a sat nav or gps to get a correct reading? But changing the drive gear is the best thing to try.

Paul

I use my GPS for the Defender as over 100 kph it is like a wndscreen wiper, but generally reads 10kph over the real (GPS/actual) speed under 100 kph

Bend the speedo needle

More for the shopping list then. Cheers guys!

When my beastie is reading 17mph on the speedo, I am actually doing 30mph.

depending if it's fast or slow, you can buy a motorcycle kph to mph converter gearbox, which is a little alloy gearbox that fits between the speedo head unit and cable, which reduces the input speed to make the reading in mph for a kph speedo. There may be a mph to kph converter if yours is presently under reading

M&P in Wales or MPS (Thefastone, no, that's there name on the net!) used to stock them