Petrol Gauge and Water temp not working

1981 GTI no MFA if that helps. Also my hand brake light is stuck on. All help much appreciated. Thanks Joss

1981 did not have MFA , handbrake light , switch under hand brake stuck or low level brake fluid or switch on master brake cylinder faulty [does same job ].

Petrol guage and water guage ? Faulty voltage stabilizer rear of clocks .

  

Thanks Chudd. Will give that a try.