I wouldn't bother keeping an eye on the temp gauge dobby, if you re-fit (i would) the mason alarm, the alarm will sound if the needle exceeds the limit which you have set via the adjuster on the front of the alarm.dobby wrote:
Need to master the art of driving with one eye on the temp guage the other on the digital guage

I'd set it at 4 for now, then tweak it subsequently to suit your vehicle/conditions.