Progress this evening. Going back to the gear drive tail, I thought I'd go back to stock and start over. Wondering how others got their HH gyro to work through the 3in1, I decided the only thing they did was to add the gyro and NOT mess with the 3in1. So, once I got the stock setup to work, I backed off the stock gyro to eliminate all wag. Then, I plugged the G90 into channel 4 and plugged the orange wire into the G90. It worked like a charm. Held the nose on one heading for over 5 minutes. Hard collective climbs didn't cause it to go off heading, in the basement anyway. I'll try it outside when I get a chance.

Brushless motor arrived today.

Kaptain Chaos, you don't think 20 or 25 for the TAIL is too big? Will it still work?

Glitching might have been caused by the G90 connection being pulled off from the servo connection slightly. Pushed them all back on securely and didn't have another glitch