Abstract: A pressure indicating apparatus is disclosed. The apparatus indicates pressure change in a device, the apparatus comprises: a pointer, optical sensing means, a planar element and indicating means. The pointer moves in response to the change in pressure, which in turn moves the planar element. Light from the optical sensing means is incident on the planar element. The planar element varies the incident light, which is picked up by a conversion means. The conversion means converts light energy to electrical energy that is used to illuminate LED from an array of LED's or activates any one LCD component from the array LCD's in the display provided in the indicating means to indicate pressure.