Voltmeter is microprocessor controlled with 7.0 to 16.0 volts accuracy. 
 
Features include:
2 1/16” diameter and 1 ½” deep
Reads in .1 volt increments from 7.0 to 16.0 volts
Automatic night-dimming
No sender needed
 
Oil Pressure 
 
Features include:
2 1/16” diameter and 1 ½” deep
Reads in 1 PSI increments from 00 to 99 PSI
Comes with S8868 oil pressure sender
Automatic night-dimming
In-dash mounting hardware
 
Water Temperature has 10-355 Fahrenheit degree accuracy. 
 
Features include:
2 1/16” diameter and 1 ½” deep
Automatic night-dimming
Sending unit included 
In-dash mounting hardware included.