I would recommend getting a wide band, really really useful! What injectors are you using?

I would start by tracing back all your wiring with multimeter, start with the alternator wire (nice and easy), should be a blue wire iirc running from your alternator light back to the alternator, some people call it the 'run wire'... Then the oil pressure light etc. Its odd that its all the lights... this makes me suspect the connector not being plugged in properly or something along those lines.

Rob,