u can go to a mechanic, or buy the gauge from auto one/repco/any tool sellers. i think u can buy a kit from the brand ABW for around the 50-100 mark. lets face it, it'll probably be used in the future. im a mechanic, and had to use mine when my timing belt tens. pulley gave way.
if the engines got slightly low compression, squirt a little oil in the cylinder, if the pressure comes up, the rings will need replacing. if not, it'll cost more...
to test, remove all spark plugs, screw in gauge, and let crank for aprox. 4 times. dont 4get to disconnect the coil packs.
hope this helped.