DigDeep said:custom dpi wont work on hwinfomonitor add on.
<host name="sidebar">
<base type="HTML" apiVersion="1.0.0.0" src="gadget.html" />
<permissions>Full</permissions>
<platform minPlatformVersion="1.0"/>
<defaultImage src="icon.png" />
<autoscaleDPI>true</autoscaleDPI>
</host>