What Huma regulator to buy ?

Hey guys
I have a fx crown and would like to replace the original AMP reg with one of Huma’s .
My crown is not the very first generation but the next one before the gen 2 .
I dont want to take out the AMP to measure it or count the washers.
I run my crown with the AMP set at 150 now .
If you can help i sure would appreciate it .
Thanks Ray
 
Hey guys
I have a fx crown and would like to replace the original AMP reg with one of Huma’s .
My crown is not the very first generation but the next one before the gen 2 .
I dont want to take out the AMP to measure it or count the washers.
I run my crown with the AMP set at 150 now .
If you can help i sure would appreciate it .
Thanks Ray

The “high pressure” option. If you don’t plan on running higher than 150/155