Is this the tank monitor you bought?
https://www.recpro.com/rv-kib-tank-sensor-monitor-panel-m23/If so, that is a KIB brand monitor. You can not get the tank lights to come on if I read your note correctly. Yes/no?
Not sure what you did under the camper; the tank sensors must have a working ground wire. Rust and corrosion have corroded the ground screws and loose contact. If you have an ohm meter, test the tank ground pin wire at the tank to a known good chassis or battery neg (-) ground.
Next, there have been cases where the tank signal wires get skinned and shorted to chassis ground going from the wall down to the sensors. I have had this happen, but it only affected 1 sensor, not all of them in my case; I was lucky the other wires did not get skinned. I had to pull a new wire.
Regarding the tank red resistor packs, did you change them and have them hooked up correctly?
KIB was bought out/merged with America Technologies. I cannot seem to find the old KIB site anymore, and the American site does not show the KIB systems that I could find anyway.
I did find this KIB manual, it may help.
https://www.dutchmenowners.org/forums/f59/kib-enterprises-tank-monitor-panel-tank-wiring-information...Hope this helps.
John
2005 Ford F350 Super Duty, 4x4; 6.8L V10 with 4.10 RA, 21,000 GCWR, 11,000 GVWR, upgraded 2 1/2" Towbeast Receiver. Hitched with a 1,700# Reese HP WD, HP Dual Cam to a 2004 Sunline Solaris T310R travel trailer.
