You put the url's you posted in image tags like this:

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Cheers,
Basement_Modder
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Hi guys, i made some experimentation with the gba running gba carts:

Bad news

I´ve tryed with 4 mhz crystal and it only speed down, but tried with an array of 8 and 4 and crashes again when switch

Good news
When you use only a 4 mhz crystal an change the speed the game not crashes anymore! course it will run slowly, but is safe for now.

In conclusion, i need to borrow some crystals around 5-7 mhz ( i hope fund them in my local store) and try it again.

For future ideas, i will put a triple switch so you can choose between 8 mhz(gb-gbc games) and 5-7 mhz(gba games)

Hi, I´m back with good news
Today i was finished the multiple speed selector on my GBA and works great!
But, there are some GBA games, dont work with the overclock mod (8 or 6 mhz, and i was using a ez flash iv)
Otherwise, all my GB-GBC games worked perfect
Basically, I desolder and re used the old crystal and putted a switch with 2 choses ; 4 mhz or overclock, and derivated that overclock wire to an other switch with a 8 and 6 mhz crystals (the last one is the only who worked fine with the GBA games, the other frezes my GBA)
And other thing: with the removal of the old crystal from the board, when you change the switch its change the speed! no more needed shortcut the wires to make it go and can be done in running system and no freze!
Well, i hope that will be useful for someone.
I cant upload any pics today, but maybe tommorrow. I promise

do you just use a standard on and off switch for this?

For his speed selector? No you can't. You need a 3 selection switch.....

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Yeah prumpa, in the future don't bump threads from 2009.