ZwifTools

ZwifTools Sauce4Zwift Mods

Current Mod Version: v1.4.0

Displays your 90-day max powers (red), and your max power for the current ride (blue).
Gives some insight into how close you are to your estimated zMAP and zFTP (arrows).
Shows your estimated CP based on your power curve (white line).

The gauge shows the average wkg of the riders near you.
The needle is your current w/kg.
The top of the red band is the average wkg of riders in the group who have 0 draft (are on the front).
The top of the green band is the estimated w/kg you need to stay with the group, given your current draft. Riding at the bottom of this range is more efficient since you are not wasting watts.
The bottom of the green band is the estimated w/kg in the group if you had the most draft available. i.e. someone nearby might have more draft than you, so there might be a more efficient draft position if you move around in the group.

Extract the file to your Sauce mods directory.

On mac, this would be something like:

cd ~/Documents/SauceMods
mkdir s4z-zwiftools-mod
tar zxvf ~/Downloads/s4z-zwiftools-mod.tgz -C s4z-zwiftools-mod

You should end up with a directory structure like:

~/Documents/
  └── SauceMods/
      └── s4z-zwiftools-mod/
          ├── package.json
          └── manifest.json