Inaccurate Tachometer?

Rotary#10 · 07-20-2010, 11:56 PM

Time to make or buy a digital gauge cluster !

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.

07-20-2010, 11:56 PM	#1
Rotary#10 Rotorhead Join Date: Sep 2008 Location: "the town " Oakland Posts: 219 Rep Power: 17	Time to make or buy a digital gauge cluster ! __________________ Currently running: 90 GTUs converted to S5 TurboII. Track car. 90 N/A GTUs.. Running project car 89 N/A GTUs in Black #2 10/6/18 Blown coolant seal undergoing rebuild and restomod.

06-05-2012, 03:43 AM	#2
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.