I have a citi golf (citi rox 1.6i) 2007 model. I have noticed that when i put the alarm on, there is a flashing red bell on the rev counter. Is this supposed to happen?

SOURCE: Hi, problem with 2007 VW Citi Golf radio security code.

The radio is in Lock-Out mode. You only get two attempts to enter the code, then it enters Lock-Out mode.
Put the key in ignition and turn on the radio for an hour (maybe a bit more). The radio should reset itself after about an hour and then you can re enter the code.

SOURCE: bmw 530d 99 model starting problem

BMW 530d SE initially wouldn't start when hot now wont start at all.

SOURCE: mk4 golf 1.4 2001 rev

Hi crossley 82
Check the engine coolant sensor. This sensor controls the fuel / air mixture, and was a common problem on that model.
Best of luck
John

SOURCE: mk4 golf stalls at times rev counter eratic when

It may be your idle control sensor or the map sensor. How often does it do it?

SOURCE: golf 2 rev counter stopped working

try he alternator the rev counter should be picked up from the w terminal on the alternator