I have a Superchips 1705 that works on all 7.3L PSDs. It adds horsepower , torque and also does engine analysis. You can read about it on superchips.com or they are also for sale on ebay and there is info there also. I used this a couple of months on a 95 PSD and then traded for a 2003 D/A. It has all the manuals necessary for installation. The price is now $160 shipped in the US. PM to
bholt9@hotmail.com.