is PS2s internal voltage at 8V?
if so then yes, you will need a connector and cabling, and if you have a chance plug it in to a DC source that has a stable regulated 8V output, rather than just a 8V wire in the car becausethat way you will avoid current spikes due to alteternator, ac, lights, windows etc. pretty sure that JBhifi would have regulators like this (something like 10V-14V input to a 8V output) to just like a fallback for your ps2 powerboard
hope this helps