This mod DOESN'T make Tommy as player, it replaces ped(s), If you want Tommy to be player you will need Ped editor (search on google).
You can replace any ped with Tommy (default i set is Claude). Use TXDworkshop to open gta3.img look at the name of ped and rename
these files from this archive to exactly same name you found and then install it.
-Use TXDworkshop to open gta3.img (located in GTA SA/models) to rename files from archive to any ped from game.
-Use Imgtool or Aci's IMG editor (I recommend you Aci's because it's faster and easier) to open gta3.img and replace files
Before you start installing this mod, create a backup!
Extract the files from archive.
Open imgtool/Alci's img editor. Find files that you have extracted: Claude.txd, Claude.dff (Or the ones you renamed)
Replace the old files with those new from archive
If it's imgtool, rebuild archive, if it's alci's img editor, then just save them after replacing.
If you have any problem, bug or anything to report, fell free to post here or contact me on any other way