In reply to:

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Looks a lot like the Sony Stalk arrangement, in fact. Wonder if it'd plug straight into the tuner module?

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The principle is the same, but the values are very different. I calculated some values to adapt my (Peugeot) stalk, which has 4 switches to a common rail, to be usable with the empeg tuner:

http://empeg.comms.net/php/showthreaded.php?Cat=&Board=install&Number=43411&page=0&view=collapsed&sb=5&o=7