I've got a 1.4 Astra Merit (1990) driving around while my cav's off having sum work done. When I got it the fuel guage didn't work, and I've now traced the problem back to the fuel sender in the tank being faulty. How easy is it to remove these senders? And what's the best way to do it?? Does anyone know?? I don't wanna rip it out and **** it up 'cos that'll be big problems - something to do with the ruddy great hole in the tank then.