Abstract: An alarm device, an improved squeeze-pad hydraulic system for a squeeze truck, and a method for converting an existing squeeze-pad hydraulic system of a squeeze truck into a squeeze-pad hydraulic system that alerts the operator of the squeeze truck when dangerously high hydraulic pressures are approached within the squeeze-pad hydraulic system are described. The alarm device comprises: an alerting device, operationally responsive to an electrical signal, having an input terminal for receiving the electric signal, and an alarm threshold switch comprising: a pressure transducing element in fluid communication with the hydraulic lines in a manner such that hydraulic fluid within the hydraulic fluid lines will exert a pressure on the pressure transducing element, and an electrical switching device, in electrical connection with the input terminal, for directing the electrical signal to the input terminal.