Join Date: Jul 2011
Location: Cologne, Germany
you could also try following the wire from the sender where it goes into the harness, and whilst some watches the gauge, wiggle it about....just to make sure it is not a broken wire in the engine compartment somewhere.
If it comes to removing the cluster, first look at all the warning lights and illumination lights, that they are working....easier to replace on if you know which is bad!
If you need a S3.5 (1990) specific wiring diagram (shows also the cluster schematic, which will help you trace connections to the water temp. gauge) then PM me with your mail and I'll send you the one I received from Jim Papajam, just before his passing.
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.