Just like idiot posted. I rent the newer kent moore J33300-A meters. The include the special pump turning tool and the line clamp. I have been doing this program for a few years helping idi owners time their engines. Sadly not one dealer or shop will time our engines. Some "claim" to do it but. Usually they do it by listening to an engine run. charge you big money and tell you its fine. Hell call me and I will time it over the phone for half price... I had 10 meters at one time and have invested a significant amount of time and money in keeping everyone able to time their engines. It is very surprising how much better an engine runs when its timed correctly. A 2 degree move makes a tremendous difference in most engines. That is about a 60 thousands move of the pump. I recommend anyone that uses my program to make several timing marks at different degrees of timing. Then when they don't have my meter they can change the timing and know exactly what the timing is because they already made the marks. If you have a new rebuilt pump and time your engine figure that timing will last at least 50,000 to 75,000 miles. Maybe more. but change the injectors and you will need to retime the engine. Timing in completely dependant on the pop pressure of the injector you choose to time by. I can supply the degrees of offset so you can time off any cylinder you want. But many years of doing this we have found that using cylinder number 1 or 4 will time these engines exactly the same. Most van application idi engines time off the number 4 cylinder because its easier to reach in the van chassis. Occasionally we find a van engine end up in a truck body too but thats not a problem. All idi engines are the same. Just some outside parts are different from a van to a truck body.