I'm in the market right now for a wideband setup for my car so that I can do my own tuning via my EEC Tuner. I've been reading up on them for the last two days and my head is spinning. From what I've heard and gathered I need at a minimum a wideband O2 setup with RPM capability and a way to datalog this information. I was going to get the AEM wideband because down the road I'm planning to run their stand alone, but they do not offer a solution for the RPM input or datalogging with their stand alone gauge. I have read up on the F.A.S.T., PLX, Autometer, and Innovate setups. I like the gauge style setups better than the other options for ease of mounting. It seems that the Innovate setup is the nicest for datalogging and they offer WB's with RPM inputs. A local guy told me that the AEM WB setup can be used with the Innovate SSI-4 as the SSI-4 will take the 0-5volt output of the AEM gauge as well as an RPM input. These features along with the log works software that comes with the SSI-4 will allow me to datalog my AF versus RPM so that I can accurately tune it. I thought that just by having the gauge and a friend ride in the car that I could get by without a way to plot AF versus RPM for tuning, but after talking to a guy that has the AEM he said that the gauge is a little delayed in terms of what it shows on the gauge and what its actually doing at that RPM. He said that the values I would see on the gauge actually happened a few hundred RPM before they appear on the gauge, but by datalogging it with software it would be accurate. This would make it very difficult to tune without a way to datalog it. The SSI-4 looks appealing, but the directions look a little overwhelming to me in terms of hooking up other inputs such as injector duty cycle and even the RPM input for the box. Innovate also makes the XD-16+ which is similar to what I'll have with the AEM/Innovate combo, but it will cost less to get the AEM/Innovate combo by about $100 I think. Plus I like the AEM gauge better. Does anyone have any input on this? I want to get one ASAP.