Rev counter and speedo recalibration?

If the error is relatively small there are correction devices on the market to correct the reading. The one I use was written up a while back in the 308 section. Here is an example but not the one in the write up which I recommend;

http://www.motorcycle-superstore.com/motorcycle/Speedometer%20Calibration

If the error is large it may suggest a wrong sender or a replacement speedometer sometime in its past or even a face change (example 80 mph face change or km to mph). Best luck getting it sorted. There are speedometer threads galore in the 308 section with new circuit boards for the speedometers being made by an fchatter.
Most speedometer calibrators like the one above are usually found in motorcycle supplies.

http://www.ferrarichat.com/forum/showthread.php?t=419560

http://www.ferrarichat.com/forum/showthread.php?t=464677

 

I just mash the gas pedal, both needles instantly swing hard right .... Fast ☺️

 

By rev counter do you mean the tachometer?

 

Adrian and a few others have detailed the inner workings of the tachometers. There is even new tachometer boards that replace our failing ones. I have one installed in my tach and have installed it in another's tach as well. They are calibratable. I suggest you PM Adrian after reading over this thread;

http://www.ferrarichat.com/forum/showthread.php?t=448208

 

Also I might just add that having both instruments go ing weird at the same time seems more indicative of a systemic issue. Maybe a bad ground? I had similar sluggish gauge response until I added an extra ground to the cluster as a whole.

 

What is up with these electric speedos? Noticed stopped at red light the odometer moves (records) sometimes.

 

That is a new one. You mean as you are stopped it adds miles to your odometer?

 

Must be some truth to the saying that Ferraris look like they are going fast even when standing still.

 

Agreed!

 

Happend on the 328's quite often.

 

Moving odo..fixed a few of them.

 

It is an easy fix. I have a a guy that rebuilds clusters and gauges I send all that stuff too. Usually costs about 75 bucks to fix.

 

If it's only the ODO which keeps moving then that's a bit strange as Speedo and ODO are driven by the same small motor in type 2/3 Speedos

Best,
Adrian

 

The Speedo itself is self calibrating, based on the incoming pulses from the gearbox sensor. You can readjust the displayed speed by removing the needle and reinstalling it though.

The rev counter can be easily calibrated with a square wave generator, there is a small potentiometer on the circuit board which allows readjusting it. Not sure about Speedo Shops on the east coast, you might want to pm board member 'Strictly Ferrari', he is also based in Florida.