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Without a wideband it is pretty much impossible to get a good ve tune. If it was me I would just wait till I install the wideband and go to the megasquirt at that time. Also I don't know if I mentioned it but using the high resolution code variant can help if you can't get the idle afr tuned in.
The wideband will have several more wires than the stock one so the best thing is just run them all in as a group and wire them to the wiring going to the megasquirt. The ground and power wires should be tied into the ms wiring so they both are running off a common ground and power source to keep noise down between them.
Once you get the wideband and mess with the megasquirt setup for a while you will get a better idea of how it works. Within a week of messing with it you will be good at it and will have no trouble tuning the car. It takes a good bit of reading and tinkering but it is worth it in the end.
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