I'm using a GM harness for one of their crate engines on my custom Gen IV LSA-like engine in my '66 Chevelle. GM sells one specifically for their LSA crate engine. It hooks up to all of the sensors and requires only ground, switched and unswitched +12VDC. It has relayed outputs for fans and a fuel pump. Definitely go with the VaporWorx fuel system that CarlC recommended. That harness and fuel system have been completely reliable for me for years now and I highly recommend them!
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