If the problem is the wiring, it doesn't make any difference whether you use the Horst internal probes or the See Level external sensor strips. If you installed the See Level with the same bad wiring, it still wouldn't work, right?
I have the See Level and recommend them.
2004 American Tradition; 2013 Buick Verano
Homebase in the Ocala Nat'l Forest near Ocala, FL