i decided i kind of love the giant cluster clock, and i already have small VDO gauges, so i wonder if anyone knows what it takes to set up a "programmable" electronic tach in lieu of the stock cluster one. i have the hall effect sensor and tach amp installed so the electrical signal should be there, just not sure what this aftermarket gauge expects, other than using a windows 95 computer (?!) to set it up.

http://www.summitracing.com/parts/vdo-333155

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'77 240D, 504H, OM617.952, etc.