Got it working very well on most readers.
Unfortunately @Eriequiet couldn’t get it working on the big Verifone readers. Haven’t tried the smaller MX915 but after I implant I’ll let you know if it works on those. It’s better than the Purewrist conversion but only 20-40% better because I didn’t nail the tuning (unfortunately this is self funded so that’s the best it’s going to get for now)