Abstract: An electronic price conversion and display system adapted for installation on existing mechanical fluid dispensing pumps wherein sensors are mounted within the dispensing pump so as to be responsive to a plurality of angular position indicators disposed to rotate in fixed relation with the lowest order number display wheel of the pump's mechanical transaction price display. The number of indicators, preferably marks or slots placed directly on the lowest order number display wheel, are chosen in accordance with a desired price conversion. A display unit, which has a digital transaction price display and which is preferably placed on top of the pump for easy viewing, houses an electronic circuit which counts the passage of angular position indicators and increments the digital transaction price display to a reading corresponding to the indicator count.