Piezo sensor

Projects General Guidance
1

I have a Piezo sensor and want to use it for analog input on the arduino i have a mega but don''t know what kind of setup i need.. do i need to make a potential divider like for a ldr or will it output enough voltage?

Here is the datasheet provided by the site i bought it from..
https://www.rapidonline.com/netalogue/specs/35-0200.pdf
heres the link to the product
https://www.rapidonline.com/productinfo.aspx?&tier1=Electrical+%26+Power&tier2=PA+%26+Audio+%2F+Video&tier3=Sirens%2FSounders%2FTransducers&tier4=Uncased+piezo+transducer&moduleno=35847&catref=35-0200

2

Usually voltage developed by piezo enough to drive analog input, look more in the classes:
http://todbot.com/blog/bionicarduino/

3

want to use it for analog input on the arduino

It will detect direct taps on it but it makes a poor microphone. If you want it as a microphone then you are going to need a lot of amplification before you can connect it to the arduino.
For what the input circuit should look like see the diagram in this:-
http://interface.khm.de/index.php/labor/experimente/arduino-realtime-audio-processing/