What you need is a 'B' (or a'C'?)
Then you don't need a triple tacho at all 'cos you just know that Nr's gonna be 107 regardless, and P&W's favourite sons are gonna do what it takes to keep it that way while 4 EECs look after them.....now that's class
Shame about the first try with the C30s!
What was all that about the PBA being a no-go item until the 'B' replaced it with a fixed length rod????