To dream of an acoustic guitar represents encouraging others to feel good noticing how special or interesting you are. Trying to make others feel good about you or find you interesting. Guitars can sometimes reflect wish to encourage sexual attraction.
To dream of an electric guitar represents encouraging others to feel good noticing how totally interesting, different, or cool you are. Projecting feelings about yourself being dangerously cooler or exceptionally more exciting than other people. Feelings about oneself being the coolest thing anyone has ever seen. Negatively, it may be a sign that you are trying too hard to show off or impress other people.
Example: A man dreamed of finding his guitar smashed and then thinking of replacing it with a new white one. In waking life he was experiencing problems with his wife sexually and was considering trying to improve the relationship.