ORIGINAL: Ferocious Frankie
This is probably a really stupid question, but don't the servos already actuate in different directions with a regular y harness? I'm looking for a way to have my elevator servos teamed up so when I use the elevator trim, both halves of the elevator move.
No. With a plain Y they receive the identical digital signal unless acted upon by an external device (reverser). Depending on the capabilities of your TX your 2 elevators will trim together if mixed by the TX. If you use a "plain Y" or "Y with reverser" they SHOULD trim together. Of course in your situation the plain Y would result in opposite movements of the elevators.