[MarkoN]

since youre using it for a certain player it should be

pawn Код:

forward Velocimetro(playerid);

pawn Код:

public Velocimetro(playerid)
{

and you didnt close OnPlayerStateChange

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(newstate == PLAYER_STATE_DRIVER || newstate == PLAYER_STATE_PASSENGER)
    {
        TextDrawShowForPlayer(playerid, Textdraw0);
        TextDrawShowForPlayer(playerid, Textdraw1);
        TextDrawShowForPlayer(playerid, Textdraw2);
        TextDrawShowForPlayer(playerid, Textdraw3);
        TextDrawShowForPlayer(playerid, Textdraw4);
        TextDrawShowForPlayer(playerid, Textdraw5);
        TextDrawShowForPlayer(playerid, Textdraw6);
    }
    else if(oldstate == PLAYER_STATE_DRIVER || oldstate == PLAYER_STATE_PASSENGER)
    {
        TextDrawHideForPlayer(playerid, Textdraw0);
        TextDrawHideForPlayer(playerid, Textdraw1);
        TextDrawHideForPlayer(playerid, Textdraw2);
        TextDrawHideForPlayer(playerid, Textdraw3);
        TextDrawHideForPlayer(playerid, Textdraw4);
        TextDrawHideForPlayer(playerid, Textdraw5);
        TextDrawHideForPlayer(playerid, Textdraw6);
    }
    return 1;
}