John -- I used to run TSD (time speed distance with timed checkpoints for the
younger members of the list) rallies in my roadster in the 60s, and used a
dual Halda odometer called a twinmaster. It shows 1/100ths, and can be
interpolated to 1/1000ths. You have to run a T connection off the cable to
get a drive to the Halda. Not a big deal. The Halda is easily calibrated.
Don't know where you would find one today, perhaps e-bay.
Also used a Curta Calculator (mechanical adding and multiplying machine
shaped like a large pepper grinder), but that can be easily replaced by a
cheap laptop computer.
Gary C
1600 red one
2000 black one
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