Sent back the tacho to ETB for inspection, they said they found nothing but were going to reduce/increase the resistance (?). This is now back with me, fitted and working. Also finished off fitting the dash tonight. Got some quotes for insurance, Adrian flux came in at £182+200xs with 3000 miles and CIC came in at £171+100XS, others were more expensive. Once I have an SVA date then I can get this sorted.