Ah GialloEvo - this is the CF1 (phase 1 ... or more like "phase 1b" since it has the T/S engine)
That has the famose "80C" temperature gauge that is actually 90C.
The later car (facelift/phase2) with the chrome bezels on the dials has 90C in the middle since I guess AR found it easier to reprint the dial than to re-engineer the sensors.
Any road up.. 80C is 90C so Alfizta's beast should read 76-78C indicated (86-88C actual).
This dial looks a bit low on that basis. My own 1.8 sits at 76C.. (indicated)... it increases to 78C on a long motorway run. When the 'stat is completely not working, the gauge reads just above that "60C" line.
I would be inclined to leave it since the summer is coming..
but buy a new one the first chance you get (or if you see a bargain) and leave it in the garage. Change it in November.
CF1 has the T or L shaped connector (I can't remember which is which.. it's the more expensive of the two types available..
) so make sure you get the right one.
Alfaworkshop has pictures of both types so you can choose the correct one (and their prices are pretty much the cheapest you'll find anyway for an OE quality 'stat, so it may be worth buying it from them).