You can buy the kits that have a gauge that you can mount inside of your car. These are less expensive and you can read them "live" as you are driving. They do not store any data, but they are less expensive than the models that do have this option. It you need the data logger, then this is not your option.
http://www.summitracing.com/parts/fst-170634
There are several brands that sell their kits like this one.