Flash ROMs operate at a speed slower than that of a CPU. The electronics module produces more heat at a first location than at a second location, and is rated to a safe operating temperature. The pump apparatus also has a system of hydraulic porting in fluid communication with the cylinder block. Moreover, the sender’s identification can also or alternatively be automatically scanned and determined to replace, add to, or otherwise overwrite the default header information programmed into the sending fax machine. The second retaining member is provided with a recessed portion that prevents excessive dislocation of the sensor diaphragm when an excessively large pressure is applied to the sensor diaphragm.