Try download this Radar Mod and replace the fronten2.txd(this radar is normal)
This radar is mod
Hard way
#Substitute the file fronten2.txd(GTA San Andreasmodelsfronten2.txd) by the
one in this package.
#Using IMGTool 2.0(you can find it at Google),open the file
gta3.img(GTA San Andreasmodelsgta3.img),find some files called radar00.txd,
radar01.txd,radar02.txd...radar143.txd(they are 144 files),select and delete
them.Then add(Ctrl+A) the radar files in this package and rebuild the
archive(Commands>Rebuild archive).
NOTES:
#MAKE A BACKUP OF YOUR ORIGINAL FILES.
#I don't know why,but I couldn't add all the radar textures at the same time
in the gta3.img file.So,if this happen with you,you will have to add the
textures one per one.
Link:
http://www.gtagarage.com/mods/show.php?id=920
