Pete Lewis Posted June 20, 2018 Report Share Posted June 20, 2018 Remove speedo, remove rim undo the two back screws remove the mechanism Turn the drive disc to the speed shown when driving, gently move the needle to the desired reading Hang the stripped out unit in the hole and test to see if you got it right, reasemble and re fit the glass and rim Simple for small errors reading 10%fast is about normmal used to be 4mph +10% so at 60 it can read 70 Hardest job is breaking the rubber 0 ring glass seal they go realy sticky You cant needle twidle for drive line major changes to the turns per mile due to the hair spring hysterisis and magnetic Drive flux. and the oddometer gearing . Pete Link to comment Share on other sites More sharing options...
Anglefire Posted June 20, 2018 Author Report Share Posted June 20, 2018 I think mine is more than an offset error - as its out by 10% across the range - so 44 at 40, 55 and 50 etc - so I assume its the wrong gear in the box? Not that I will change anything unless its simple - pulling the box just for this would be insane. (Though its something I might do for kicks!) Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 20, 2018 Report Share Posted June 20, 2018 Thats within the design spec then has to be between spot on and 10% fast cant read slow As the 'error' is consistent a needle move should work fine Triumph did not do many pinions or worm to enable one speedo they had different tpm speedos for every model Pete Link to comment Share on other sites More sharing options...
NonMember Posted June 20, 2018 Report Share Posted June 20, 2018 4 minutes ago, Pete Lewis said: As the 'error' is consistent a needle move should work fine No, the needle shift applies an offset but Anglefire has a ratiometric error. 4 minutes ago, Pete Lewis said: Triumph did not do many pinions or worm to enable one speedo they had different tpm speedos for every model That varied. On early cars they stuck with similar drive ratios and picked the right speedo TPM. From some time in the '70s they standardised on 1000TPM and picked the right drive ratio. Link to comment Share on other sites More sharing options...
Gully Posted June 20, 2018 Report Share Posted June 20, 2018 I had my speedo recalibrated by Speedy Cables after I changed the diff. It over reads by around 5% now. Gully Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 20, 2018 Report Share Posted June 20, 2018 I've absolutely no idea what mine does, being an 18/50 gearbox with J-type O/D on a non-O/D diff. I just do the speed everyone else is doing unless it's on the motorway / dual carriageway, in which case I just tootle along at an indicated 65 or so and let everyone else overtake me. 1 Link to comment Share on other sites More sharing options...
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