I know nothing about this topic but if the helm you have was off a twin ITS set-up which I'm assuming is 2 rams per drive and you want to run it on a single ITS I'ld guess it might be running to much pressure based off Sabercats info. A conventional twin drive bravo uses 2 rams and a tie-bar, a twin ITS uses 4 rams. Steve

Helms
 

The Helm You Choose Is Sized To The Power Steering Pumps And Rams. This Helps You Not Oversteer The Boat. The Helm You Have Has A Code Number 291 (rated For 1000psi) And A Option For A Relief Valve Internally.
The Helms We Sell For A Power Single Has 4.5 Cibic Inch Per Revolution. ( 211-1007-001) And For A Duel (211-1009-001) And For Big Drives Nxt (211-1012-001)
These Are All Open Center Helms.
If You Have More Questions Give Me A Call 586-790-8880 Ext251