I have seen discussion about creating an RPM system for MTA. I saw a video of another manual transmission script with RPM system but it wasn't available anymore, so I created my own concept.
It features a clutch and up to seven 24 gears + neutral. It's still W.I.P as it lacks reverse gear, has no torque change between gears (yep, you can go for a trip by using just the fifth gear, currently) and every car uses same engine sound.
Gears and sounds can be changed in XML files.
--Download--
https://community.multitheftauto.com/index.php?p=resources&s=details&id=7466