Sprout97 

I'd recently replaced the "original" stoker computer, a CD300DW, with the afore-mentioned RD410DW. What I'm wondering is, would this new ISC-10 sensor, w/ its 2.4 GHiz, also drive an addition computer for me, the captain? (I'm somewhat limited with data, since my Flight Deck hasn't had all the functions for a couple of years, even with multiple resets and even trying a newer FD computer.)(Gotta have that graphic gear map!)

Scraper

Before buying our tandem, wife had a Cateye CC-RD420DW on her single. When we bought the tandem, we both wanted heart rate, speed and cadence at both of out tandem positions. Decided to get a second Cateye CC-RD420DW for the tandem and try it. There was mixed info on whether it would work, and Cateye said it would not, but it does. We both have individual heart rate straps synced to our specific head units, and both head units sync to the single speed and cadence sensors. And my wife can swap her head unit back to her single bike and it automatically recognizes the sensors there as bike 1 (tandem is bike two for her).

The only problem we have is she has trouble registering an accurate heart rate. Sometimes works, sometimes not.

ReedCycle

I am using the RD410DW on our Mocha for both captain and stoker with a single sensor - it works great. I have been using a previous model that is now discountinued (V2C) on our Calfee for the past 7 years - that works great too. A benefit of getting two sets is having an extra sensor - I needed to replace the sensor on the Calfee (V2C) after 6 years, but the computers were fine and are going strong.