On Friday, December 20, 2019 at 4:58:53 PM UTC-5, Per Carlin wrote:
Is the variometer integrated with the Computer or is it separate and connetced via a wire?

My old Zander SR940 had an separate Guage for the variometer and it was possible to reverse the polarity in the electrical wiring. That would result in the behavior you describe.

It is separate and from what I could see, it was connected by two electrical wires. These wires also seemed to have been (poorly) reconnected at some point by twisting the wires together and using electrical tape, so the reversed polarity seems very likely to me, especially after reading your post.

I'm still unsure of the vario model, but I confirmed the computer is a Zander SR 800. I think I will try swapping those two wires next chance I get (and soldering them properly while I'm at it).