Joe & Twin Vipers:
I just bought (this week)an Autometer electric fuel gauge and found out that they have converted most of their electric transducer/gauge packages to a 0-4.5 volt output. I believe any of their gauges manufactured after 5/1/04 are this way. They are trying to have all their gauges capable of feeding into their new logger.
I have an Innovative air/fuel logger that has the capability of five additional inputs. I now have air/fuel, rpm and the fuel pressure input into the logger. The new autometer electric gauges now have an output set of pins on the gauge, not the transducer. I mounted the gauge under the hood and ran the data from the gauge into my logger.
All you need is a logger. I would highly recommend the Innovative logger, or you might want to look at the Autometer setup. IMO you should start with the a/f and everything else is icing on the cake. In your case if you watch boost and not a/f it could be catastrophic
Dash mounted gauges are all show, you cannot accurately watch all the gauges and give adequate attention to driving/shifting/stopping. The air/fuel is the worst it is almost useless unless you can log. The fluctuations are too great and come too quickly to get an accurate reading with a gauge.
If you check Autometer go directly to the factory, the retail outlets don't even know about the conversion.