I purchased this megasquirt from diyautotune.com and I had the truck running on this but have decided to step my game up and go 1jzgte. This has to go to fund the swap. I purchased this from diyautotune and had it modded for the vast ignition system and it works great. The two wires not going to the yellow plug are for a wideband and the gm temp sensor. Also include with this full standalone and adapter harness I will include the gm open element air temp sensor 1/8" npt barb fitting and vaccum line. This is EVERYTHING you will need (minus wideband) to get your truck running with megasquirt. 425 shipped plus paypal fees of 3%