Damn, i just can't get pass the first few scorp and there's no way i can bypass the guard dog. :(
I recall back in the days when i play FO2 vanilla, it wasn't that tough.
Right now i'm using the Restoration mod and the megamod and things seems so different. :(
Anyone have any advise? BTW, my STR and END is pretty low as i pump most of the points in Per, Agi and Int.

If you walk three hexes away from them after you attack they won't have enough AP to do anything other than shamble next to you and wait.

I agree with you it is tough, I am maybe a jerk, but I cheated and used falche2 to get through it.

As Rollie suggested you should be able to always hit a scorpion and then run away. This way they will only ever walk up to you but won't have enough action points left to attack you. You then only need to repeat this until they are defeated.
I think it depends on your character's stats, but in my two most recent tries I always had 2 turns if the enemy started the combat. So I would walk closely to a scorpion (Again so close that it will walk up to me but can't attack) until it attacks, so that I could hit it at least 3 times before I have to run away.
The final fight with the guard can be avoided, I think, if you are intelligent enough. Otherwise just make sure you aren't low on health. Unfortunately you can't avoid being hit if you have about 8 action points. I still always hi the guard once and then run away. You can also exploit the quicksave a bit. Save before each turn, then attack. If you hit him and hopefully he didn't hit you, save again. Otherwise, load and try again. Obviously this can be tedious, but you should be able to win rather easily like this :)
[Edit]
Dang it, I forgot about the most trivial solution: If Fallout 2 handles this like Fallout 1, you can change the difficulty and combat difficulty at any time in the options without having any disadvantage. So if you set the difficulty lower that is really all that changes, experience points earned, etc. will still be the same. That should get you through the Temple of Trials quite a bit easier.

Thanks for all the tips. Finally managed to get to the last stage with the guards. However, i think its because i'm not playing the vanilla, at the last stage, i was shoot with a few question regarding my ancestor thinggy. No fight which is different compared to the vanilla.
Anyone know how should i answer the question? It always say i'm not worthy of the ancestor knowledge and wisdom. WTF!

I've completed the trial before but I don't remember how I answered the questions, or if I just had to fight the guard.
Sorry I can't be of more help :{ I'm thinking I just fought the guard.

I don't recall any kind of trivia at the end of the temple. I suppose that is likely one of the things "restored" in the "Restoration Project" mod :)
I've also just started playing Fallout 2 again, as I've only played it few hours in the past. But I'm only using the latest official patch and Killapp's unofficial patch. This fanpatch is apparently the only one which doesn't add or change anything about the game, but merely fixes tons of bugs and other problems. At least I rather want to play Fallout 2 "vanilla" on my first playthrough :)

Use Sneak, you don't have to fight at all. You can sneak past even without having tagged Sneak. I didn't have it tagged and I was also gifted (skill penalty), it's still fine.
PS - nevermind.

that beginning temple is a pain... first time i beat it by putting the difficulty on easy, the second time i had enough speech/intelligence ability to talk my way out of it.