there are 3 guitars in vice city. You can find it in a place that is inaccessible such as bikerbar, concert hall and recording studio. I took one of the three models of the guitar to make it as a weapon to replace the bat. I have also made a new weapon icon but it is not good because i dont have a high photoshop skill .
delete bat.txd and bat.dff in your gta3.img then add my bat.txd and bat.dff. After that, rebuild your archieve and you are ready to play! Have fun whack people with this painful guitar!