To install use UNITY ASSET EXPLORER if you are unsure how to use UNITY ASSET EXPLORER there are videos on youtube
The files that come with this is
1. sharedassets1
+ satsuma_dash_gauges.tex.dds
2. sharedassets3
+ extra_gauges.tex.dds
+ rpm_gauge.tex.dds
+ tachometer_gauge.tex.dds
3. UNITY ASSET EXPLORER
Thank you for downloading this mod