Hello, I'm looking for a cheap compression tester for an early 1994 7.3 IDI for a friend. All the articles I am finding are about the powerstroke 7.3's. Do any of the Harbor Freight ones work without buying any extra adaptors? Is there any other brands out there that will work? Thanks.

 

Try reading this thread:
https://www.ford-trucks.com/forums/1...sion-test.html

 

I use this one for my bobcat and tractor, i havent done one on my idi but i'm sure it has all the necessary pieces