Inaccurate Tachometer?

sa22c · 06-05-2012, 03:43 AM

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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06-05-2012, 03:43 AM	#14
sa22c The Newbie Join Date: Jan 2012 Posts: 21 Rep Power: 0	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.