Originally posted by bigray1111
yeah i just dont understand what it has to do with my car?

It's for testing your MegaSquirt ECU. It's not completely necessary if you buy a pre-built ECU, but you'll want one if you're building your ECU from scratch or modifying it.

Also, you should know that even though DIYAutoTune is a great company, their MegaSquirt ECU's aren't configured for these cars. Google "420a megasquirt" for a listing of companies that sell 420A-configured MegaSquirt ECU's.