These are the Manifold Pressure Sensor (MAP Sensor) Some located at the throttle body, while others are mounted to the firewall of the body of the Jeep.
#23 is 1996-2004 or maybe 2006 is the latest style attached to the throttle body.
#25 is for 1993-1995 V8s MAP sensor on the throttle body
#55 is the 1987-1995 4.0s MAP Sensor Located on the Firewall.
