I made one for myself. It cost about 10 bucks. There was a plan on one of the forums, Hardcore I think but I don't have them anymore. The key is a 5volt regulator you can buy at Radio Shack for about 5 bucks and then all you need is a couple leads and a 9 volt battery to power it. The idea is to provide 5 volts to the TPS thru two of the leads and read the output voltage off of the third. You may want try a search on the old forum to find the details.