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Bob,
Since my aircraft was a Riley conversion, I replaced those old engine monitors and I assume that no new holes were needed. Sorry I don't have more details on that point.
I agree with your point about the Shadin - the %HP is not essential. However, it's the digital RPM that I miss the most.
Let me offer a case fo why two different displays could be handy. My rear engine cyl #5 is the hot one, and the front is #2. I don't use auto-scan, so I always set it to the probe I want to watch. On the 760, you have to watch the same probe on both engines (meaning both have to display #5, or both display #2). Two separate units would let me independantly display these. But there's a significant price to pay for this "benefit."
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