have solved half the problem.... connecter from back of car, tank, tail lights etc was not pushed right in BUT the termp gauge still does not work

sometimes capaitors go bad too and make the speedo bounce at certain speeds.

Check the voltage regulator.

9 out of 10 times it's the "dash voltage regulator" a small device usually on the back of the gauge cluster, now if it is only one gauge, perhaps bad ground, or sending unit,
but if both gauges are not working , then the regulator.

I had a very similar problem on my 120Y... It turned out to be the ground wire on the combination plug being a bit 'iffy'. $10 with an electrician and the this was perfect again. Hope this helps !

hi
has any one have any ideas why the temp and fuel gauges won,t work on a 1200 coupe i have put in a new temp sender every thing else works fine .
also i have a gregorys 1200 workshop manual, which wiring diagram is the correct one to use,the B110 does not have a tacho , the NORTH AMERICAN one has tacho but also has a warning buzzer of some kind very confusing any ideas on problem much appreciated thanks