Holly Terminator X or Megasquirt

mikestang63 said:

IF you want the closest to true plug and play go with the PRO M. You cannot compare the quality, fitment and ease of install. Downside is Chris is THE support and not many people tune it- but honestly that is for reason in that it doesn't need it like the Holley. IMO the stock EEC and a good tune is enough for most builds. Personally I don't see what the hopla is about the Holley system- you need to re use wiring from the stock harness for your A/C .airbag, and other components for them to work and 90% of the people then go and need to get it tuned anyway to dial it in. If you go onto the Terminator boards you are seeing post after post about poor quality control on the harnesses and months to wait for delivery. I think when you factor in the cost of it $1500 or so. then add in the sensors, A/C harness,. and then additional tuning you are well over $2000.

just my 2 cents

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You only replace the engine harness thats it - As you do with any aftermarket standalone besides the plug and play stuff . The allure is the fact that you aren’t dealing with a 28 plus year old engine harness . My holley - I tied into my fuel pump trigger wire at the relay under my seat . Any additional wiring is for stuff you plan on adding that’s it’s capable of doing or controlling .

Now I’ll admit since the terminators the harnesses haven’t been what they were when I bought mine .

They are still light years better then having an old harness as long as you’re willing to go over it quickly to make sure it’s all good.

Next thing is - of course all you hear is complaints on a terminator. The price point draws in a crowd that may have not gone for a stand alone otherwise and expects it to just be magic . It isn’t .

None of them are . Also when they are selling that many of them there is bound to be complaining .
Look up MS complaints and you’ll find plenty as well.

With that said I have personally been involved with 3 different terminator setups including first starts and they are all running around flawlessly. 2 Ford based 4.6 single turbo and 347 T trim car , one LS motor car that’s getting a blower . I’m in the process of doing a 4150 stealth on a big block olds as well .

Any of the setups including the pro m would need to be tuned considering the fact I’d you’re making the jump your setup is far beyond what a stock processor will do .