John, the flasher unit is a 5 terminal Hella unit 4DM 003 474 01, from memory the 01 simply means it has a bracket. If you have an early component board with a row of ceramic fuses along the top the flasher unit is the bottom right component, if you have the later board the flasher is screwed to the board again bottom right just underneath the intermittent wipe unit.
The hazard switch is up by the radio position as has been mentioned, it is actually a Triumph TR7 component and quite hard to source. It suffers from contact corrosion but can be carefully dismantled and cleaned, it is no 1 suspect if the indicators fail to light as it provides a switched feed to the stalk.
Bawtrylwt, the transducer for no 1 tank can be in one of two places. On early models with 10 components on the block it is the top right component, on later models with 9 components and a blank at top left it is the second one down on the right hand side. In both cases the transducer is a larger component than the smaller pressure switches that surround it.