Hi Dohani,
I will try to use short sentences.
Maybe you are using a translate machine.
The most usual analogue frequency meters are for mains frequency.
If i wanted to make an analogue meter for 50c/s.
I would probably choose a centre-zero type of moving coil meter.
I would arrange inductors and capacitors like a bridge.
Over frequency would result in movement to the right.
Under frequency would result in movement to the left.
If you can rely on supply voltage.
Then cycles over and under centre could be marked.
48 ... 49 ..< 50 >.. 51 ... 52
(its 50 where i live, yours may be different)
The principles are simple,
but hard to explain with short sentences.
Inductors increase impedance with frequency.
Capacitors reduce impedance with frequency.
There is not much demand these days for
an analogue frequency meter.
Most stuff is digital.
Best of luck with it, John