Comically bad
"This may be the most broken product I’ve ever received. The awful clip ISSPro uses to connect to the gauge aside (I would avoid on that alone), the gauge itself was shorted (not just the inductor for the needle, but straight open between pins 5 and 6), the harness needs a 3rd wire, the connector had both solder joints to the pins broken, one of the pins was too big making a loose connection (that was really fun to troubleshoot), and there was a break in one of the wires. After eventually throwing all the wiring that came with the gauge away, I, mistakenly, still thought the gauge was good because I thought the needle moving at startup was more than just for show… it is not, and the gauge itself was bad. Even IF ISSPro offered any kind of support (they haven’t) there no way in heck I’d risk the High pressure oil system in a 6. 0 with one of these gauges again, 6. 0’s have enough problems as it is. Don’t cheap out on the HPOP gauge."