The fuse rating is stamped on the fuse, alternatively look on the alternator for the current output and get a fuse rated slightly higher.

Hi Do you know the fuse location of the temperature gauge in the Mark 1 Octavia ?I recently tried installing a voltage stabiliser and somehow my temperature gauge was spoilt during installation. I have since remove the voltage stabiliser but the temperture gauge is still down.

It could just been that the coolant temp sensor has failed - has two feeds - one for the ECU and one for the dash, so it could just be that half of it has failed.