Here are a few pictures of the harness I make for the beams. This particular harness was based off of a badly cut beams engine harness and is for a 91 mr2:
http://69.15.41.214/mr2/beamspics/beamsharness1.jpg
http://69.15.41.214/mr2/beamspics/beamsharness2.jpg
http://69.15.41.214/mr2/beamspics/beamsharness3.jpg
Notice the adapter plug for the ecu plug on the mr2 body harness. There's also a power connection for the msd tach adapter most people use.
Here's where the harness was cut originally:
http://69.15.41.214/mr2/beamspics/cutbeams.jpg