Can i connect a VU meter in parallel with the speaker? if not, where's the right place to connect a VU?

Ps: It's a TDA2009 typical circuit and there's no preamp.

 

Like I said on the other website, you do not tell us the power supply voltage for the TDA2009 and its speaker impedance so we can calculate the output voltage feeding the input of the VU meter.
You also do not tell us the input sensitivity of the VU meter.