I built up this bike this past spring. The heart rate monitor is a wrist watch type unit with a handlebar adapter. The GPS is about 10 years old. Used a Delta Computer Caddy to mount these two items instead of a stem cap. This bike has S&S couplers so I used a wireless computer, VDO was on sale when I was looking for computer.



Another bike. This one uses a wired computer and an 1980s vintage type handlebar bag and mount.



I tried a bell with a compass built in, but there was too much steel in the stem bolts and that affected the compass too much.