John, What I stated on my first LED replacement post will work great with steam or PS2 steam and diesel. I am not a fan of the PS3 diesel kit. That 40 pin connector can be worked carefully by those who are careful. I have seen several 40 pin connections that have bent pins and the rest gets nasty. If we could get at the back of the board it would not be a problem with the pins. Not so. They are a pain.
I will not do an upgrade when someone has played with the kit. I want to be the person who opens the box. I gulp when I see a member who purchased boards off the internet and some wiring. Do it one time and do it right.
BUY THE KIT.