Gauge Cluster
The Water Temperature Gauge can be reprogrammed to different values. This is helpful to modify the range in the middle where the needle doesn't move over a wide range of temperatures. Some like it to be full linear, but the downside is the needle will move around quite a bit during even normal driving. Others prefer a smaller dead zone in the middle that represents acceptable temperature, so anything below or above represents a non-ideal water temperature.
Water Temperature Gauge - Reprogramming
The Fuel Economy Gauge can be modified for bigger injectors, up to a finite limit.