Maserati 222 SR problem

[Thorsten Ruge]

Is the speedometer counting the right distance? If yes you'll have the problem that the needle axis only slipped to far to the left/anticlockwise, i.e. also the lower speed until 30km/h will not be indicated immedeately? Then open the dash hood and readjust it with care to the right/clockwise.  
Is the speedometer failing in counting the correct distance as well? Then adjust the poties at the back of the unit.

 

Inside your tank the swivelling  arm of your fuel level indicator might be bad or its joints arrested. Access it through the round revision cover on the top of your empty tank. If you are already working at the tank, clean as well the little cap filter sitting down on the left, directly on the fuel discharge pipe !

There will be normally no aircon filter in this '91 modell, but you will have organic mold built up inside the evaporater coils. This occurs if the rubber drop out hose(shown below as well on pic 4-14) for the condensation water relief has been clogged for longer terms; check this from underneath the car around the bell housing.
To clean the coil from the mold,- look everything up regarding "Armaturenbrettrausreißen" in this forum,- we have real experts here!

 

 

Just wanna add one little hint here: Hope you made your engine oil & filter change with at least synthec quality like Mobil1 15W50? If not, your 2,8L is gonna die soon depending on old mineralic oil residues! As counter measure, I recommend another oil & filter change for prevention only!