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My 82 sa22c tacho is out. I fixed my speedo by swapping in an underdrive speedo drive gear and putting a taller diff in and also taller tyres.
My speedo is actually under reading by about 10% at full speed ~124mph across the 1/4 speed trap. Its excellent because the speeding fine threshold is about there, so you actually try to make sure you are not speeding!
Anyway the tacho is notoriously bad. I know if I go past 8 really its probably only mid 7000s but not sure.
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