Using two controllers with one analog input device

I have been using RoboteQ controllers for a few years now and have been very happy with the product and the support. My latest project is using two separate controllers that are using a single axis from an analog joystick. What I am trying to find out is whether there are any known issues when sharing an input signal. I would assume that the high input impedance would prevent any real current usage or leakage between the two separate controllers but I am not sure. Is there any recommended separation of filtering needed when tying the two controllers together?

Thanks in advance for your help,

Yes. Some things to consider first.

By doing this, it will create a ground connect between the ground pins of the 2 DB15 connectors. The thick black (GND) wires of both controllers must be firmly connected to the battery first.

Then, the 5V reference must be connected to the 5V out of both controllers. Because there are diodes, there is no danger of one 5V going into the other. using this setup, the \"relative\" capture will be made using the same 5V as reference since they are suing the same input. If the 5V is picked from only one of the 2 controllers, this will work, but the capture precision will be a little less accurate on the controller that is not powering the pot.