I don't have a compression gauge, but I get a lot of that kind of stuff from Zoro
Otc Diesel Compression Gauge 5021 | ZoroOrder Otc Diesel Compression Gauge, 5021 at Zoro.com. Great prices & free shipping on orders over $50 when you sign in or sign up for an account.www.zoro.com
I have ordered it, thanks for the tip.
Unfortunately they could not offer the adapter, have now ordered this:
OTC Tools (OTC6660) Ford 6.0L Diesel Compression Tester Adapter 731413506215 | eBay
Find many great new & used options and get the best deals for OTC Tools (OTC6660) Ford 6.0L Diesel Compression Tester Adapter at the best online prices at eBay! Free shipping for many products!
Thanks again Mark!