computer wiring for sandrail

I am putting an 89 jetta 1.8 with digifantII fuel injection into my wifes sandrail... the plugs that go to the connectors on the engine were vary easy to figure... now I have to put power to the computer and the associated harness... the wires run from the computer to various plugs and to a couple relays, a few more wires run from a fuse block to the relays... the wire colors do not match every colored wire in the haynes book I am using... I need help figuring how to hook the battery to the harness and to the starter and alternator, and then to a switch to turn power on and a mometary to run the starter... any help will be appreciated...

I have a jetta motor in my rail (2.0 bottom with a 1.8 head) but I run a weber sidedraft carb so other than the ignition setup I don't have any computer wiring... and while I can drive and turn a wrench I cannot figure wiring :)...

Thanks - Mickey