[DieTeetasse]

Not tested, just wrote it down in the university:

PHP Code:

#include <sourcemod>
#pragma semicolon 1

#define HUD_INTERVAL 1.0

new bool:TankAlive = false;
new TankClient = -1;

public OnPluginStart()
{
    HookEvent("tank_spawn", Tank_Spawn_Event);
    HookEvent("player_death", Player_Death_Event);
}

public Action:Tank_Spawn_Event(Handle:event, const String:name[], bool:dontBroadcast)
{
    TankClient = GetClientOfUserId(GetEventInt(event, "userid"));
    TankAlive = true;

    CreateTimer(HUD_INTERVAL, HUD_Timer, INVALID_HANDLE, TIMER_REPEAT);
}

public Action:Player_Death_Event(Handle:event, const String:name[], bool:dontBroadcast)
{
    new client = GetClientOfUserId(GetEventInt(event, "userid"));
    if (client == TankClient)
    {
        TankClient = -1;
        TankAlive = false;
    }
}

public Action:HUD_Timer(Handle:timer)
{    
    ShowHUD();

    if(!TankAlive) return Plugin_Stop;
    return Plugin_Continue;
}

ShowHUD()
{
    if (!IsClientInGame(TankClient)) return;
    if (!IsPlayerAlive(TankClient)) return;

    new String:text[128];
    new Handle:HUD = CreatePanel();

    DrawPanelText(HUD, "Tank Info:");
    DrawPanelText(HUD, "##################");

    if (IsFakeClient(TankClient)) text = "Player: AI";
    else Format(text, sizeof(text), "Player: %N", TankClient);

    DrawPanelText(HUD, text);

    new health = GetEntProp(TankClient, Prop_Send, "m_iHealth");
    Format(text, sizeof(text), "Health: %d", health);

    DrawPanelText(HUD, text);

    for(new client = 1; client < MaxClients+1; client++)
    {
        if (!IsClientInGame(client)) continue;
        if (IsFakeClient(client)) continue;
        if (client == TankClient) continue;

        SendPanelToClient(HUD, client, HUDHandler, 3);
    }
}  


public HUDHandler(Handle:menu, MenuAction:action, param1, param2)
{
}