@w101tdi It uses an FT which is put in the inputcontroller of the Engine. Allow me to copy paste an explanation I made to someone else. It looks spaghetti but is relatively easy to work with once you know the basics.
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Here is the FT Edensk developed so I can show what is to be adjusted
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(SelectedWeapon="Gear1" ? clamp01(-pow(((7.7-GS)/12.7),2)+.4) : (SelectedWeapon="Gear2" ? clamp01(-pow(((16.75-GS)/19.5),2)+.2) : (SelectedWeapon="Gear3" ? clamp01(-pow(((27.55-GS)/27.55),2)+.15) : (SelectedWeapon="Gear4" ? clamp01(-pow(((41-GS)/36),2)+.1) : (SelectedWeapon="Gear5" ? clamp01(-pow(((56.5-GS)/46.5),2)+.06) : (SelectedWeapon="Reverse" ? clamp01(-pow(((7.7+GS)/12.7),2)+.95) * -1 : 0)))))) * Throttle
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As can be seen the FT is split into values determined by each gear. Adjusting the numbers in each gear is done to change its effects. The numbers next to -pow (such as. 7.7-GS)/12.7) I've generally adjusted to determine the gear's maximum speed, while the number next to the + is used to adjust the acceleration. Note that these two can affect eachother so some precise adjustment and trial and error is generally needed, particularly if you're going for specific values in acceleration and max speed for each gear.
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Generally, low gears have higher acceleration but lower top speed, high gears have vice versa. Progressing through the gears involves going from Low Top speed, high Acceleration gears to High Top Speed low Acceleration gears. The * -1 reverses the entire input for the Reverse gear thus allowing it to function as such.
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For making adjustments I highly recommend copying the FT and putting it in a word doc. It'll make adjustments easier, allowing you to see the whole FT and copy-paste it into the engine's input.

How did you make the gear system@MintLynx

Thanks

@w101tdi I wish you luck with it, I'm always happy to see peeps customize these things!

Thanks part 2 is coming…

Nice Decals and Aero, but you should have removed drag and mass from the decals and checked the connections of these parts frequently while adding them, if not upped the engine horsepower. The performance is hampered and some parts (beyond the doors which is understandable given the decals over them) are left stuck when they should move. Not to mention the car seems to bounce around for some reason when driving along.