[Baboon]

hmm, onplayerentervehicle put textdrawshowforplayer(playerid, Speedo[i]); with has speedo etc. Btw, why making it with a loop, use SetTimerEx("UpdateSpeed", time, true, "d", playerid); it creates one time for the playerid, put it under onplayerentervehicle and destroy it under onplayerexitvehicle...

UpdateSpeed() will become UpdateSpeed(playerid)

Remove the TextDrawHideForPlayer and ShowForPlayer and just change the textdrawsetstring each time.