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There are so many data loggers on the market there are only two reasons to reinvent the wheel. The first is because you really want to make your own, the other is because you have special needs that can't be met with an off the shelf system.
For your needs the products developed for race cars are probably best suited because the developers had mad many of the signals you want to collect in mind. The products aimed at the weekend auto cross and other non professional race teams will be the lowest cost. There is a lot of stuff out there which means competition, which means you can buy it for cheaper then you can develop it, so you may as well save yourself hundreds of hours of development time.
Do some hunting around on the internet, a Google search for "race data logger" turned up some good prospects. Be creative with your search string to narrow the search. Look carefully at specifications. You want something that collects for a long period of time so you can collect for a whole tank rather then just one race. You probably want a lower sampling rate than most race teams are collecting. Also look at the support tools, a good package will provide some analyses tools or at least make files that import to your favorite spread sheet.
Mike
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