DUAL TIRE PRESSURE EQUALIZATION MONITORING SYSTEM

I've tried the crossfire and cat's eye. Really prefer the cat's eye because an elbow on the crossfire set I had cracked along a seam, then didn't register that it let all but 30psi out of the inside dual. The tire had air when I kicked it in the morning, and the crossfire showed about 100psi cold, then I did 650 miles under a load of onions in the middle of summer through the desert at 70mph, and when I shut down the tire that had 22/32" of tread on it that morning was so badly cupped I couldn't trust it anymore. Crossfire still read 115psi until I pulled it off because the soapy water test showed nothing but foam down the casting seam on the inside elbow. Never had a problem with cat's eye.