[Misiur]

Ok, so you need to store a float inside sv[3], then round it only for format function:

pawn Код:

public Speedometer(playerid) {
    GetVehicleVelocity(GetPlayerVehicleID(playerid), sv[0], sv[1], sv[2]);
    sv[3] = floatsqroot(((sv[0]*sv[0])+(sv[1]*sv[1])+(sv[2]*sv[2]))* 181.5);

    format(fquery, sizeof(fquery), "Vehicle: %s~n~Speed: %i KPH", GetVehicleNameFromModel(GetPlayerVehicleID(playerid)), floatround(sv[3], floatround_round));
    PlayerTextDrawSetString(playerid, Speedo[playerid], fquery);
    
    return 1;
}