It would simplify the 46rh install if the mechanical TV cable could be controlled by means other than a mechanical connection. I've been thinking about using a pneumatic cylinder. The distance the TV cable arm swings is less than 4" so the cylinder stroke would be at least 4". Most of our vacuum at idle is around 15psi. I'm thinking a 1" diameter cylinder with 15psi would pull an extended shaft with 15 pounds of pull. This would require a spring with tension less than 15 pounds. The idea is with the engine off (no vacuum) the spring would pull the lever to its max pressure setting. With the engine idling with 15 pounds of vacuum it would over come the spring and pull the lever to its minimum position. This is the same action as the TV cable provides. The tension of the spring moving the TV lever toward the max (wot) position as vacuum falls toward zero representing wot. As boost pressure rises it only assists the spring by holding the lever in the max position. The spring tension verses vacuum pull will need to be adjusted to have the TV lever move directly proportional to vacuum. Vacuum being the controlling force taking the place of the mechanical throttle position. Now as the cylinder diameter is decreased this reduces the physical pull of the shaft which then require less spring tension to counter act the vacuum. Using a cylinder of .394 (10mm) only requires 6 pound spring to counter act vacuum pull. We are now looking at typical carbreutor return spring with a wide selection readily available. I have the cylinder on order and will start testing in a couple weeks. Thoughts....