you need to this things for fixing and real speedo : 
https://www.gta5-mods.com/tools/dashhook
https://www.gta5-mods.com/scripts/dial-accuracy-fix

and for working wipers need to download this :
https://www.gta5-mods.com/scripts/vehfuncs-v

if the last version not work , download 1.2 version