How to pull one field from custom module into Contacts

How to pull one field from custom module into Contacts

Hello,

I have a custom module called Rides that has entries related to my contacts. Each contact could have several "rides".
The connection between the custom module and Contacts is Email.

I would like to show on my Contacts page the date of the latest entry in the custom module. That date is already a field in the custom module so I am just trying to pull that field. 
That field would update with the latest ride when there is a new one.

I have tried several examples I found on the forums but with no success.

Please let me know.
Thank you,

Aurélien