I've had a Tweecer and a Megasquirt PNP. I've use BE and other software. I never got the MS PNP idling right, and there was no support, so I pulled it out and put it up on a shelf.
I just bought and I'm playing with a Holley HP.
I have to tell you, I now consider trying to patch around the A9L with all the add-ons a silly thing to do.
The MS and tuning software was a total waste of almost 1000 dollars. It does not even do SEFI. Once I paid my money, only to learn it would not do SEFI and when I could not get it to idle correctly, I was all on my own.
The Holley HP has very intuitive software and is a professional looking package. I bought the harnesses and everything, and it all very professional. I do electronic design for a living, and I can tell the Holley is heads and shoulders above the stuff I have been running. While it was almost $1500 (my cost through a place I do some work for), it is the way to do things. I wish I would have done this years ago.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)