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@Jonny69
Someone at work having a clear out passed me a drillium Huret Jubilee. Made me think again about a build with dt shifters. It's got a different shifter cable pull to Shimano SIS, Campag etc but I wondered about indexing if there was a possible combination of indexed dt shifter and cassette spacing that worked.
Started here: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/
Asked the question over on Retrobike and this turned up: http://www.retrobike.co.uk/forum/viewtopic.php?f=23&t=349836
On that Klein, SRAM 10-speed indexed to 9 cogs of a Shimano 11-speed. Assuming that actually worked, shifter cable pull is 3.1mm, Shimano 11-speed gear spacing is 3.69mm so the derailleur pull/shift ratio is about 1.19. I stuck that in a spreadsheet with all the other indexed dt shifter cable pulls and cassette spacings and looked for the closest matches.
The following combinations are close:
-Shimano 6-speed shifters are close to Shimano/SRAM 10-speed road, Shimano 10-speed mtb and SRAM 11-speed mtb cassettes
-Campagnolo Syncro 8-speed shifters are close to Campagnolo 10-speed cassette
-Campagnolo Syncro 9-speed shifters are close to Campagnolo 11-speed cassette
All assumes the Klein worked, of course. I can check some of the above, though, because I have some indexed Shimano 6-speed shifters in my drawer and a Shimano 10-speed cassette. Only thing I don't have at the moment is a frame that can take downtube shifters.