The key piece of information in the photo is the serial number ends in /63 indicating that the instrument was delivered in 1963. So the system it meant for would’ve been spec in a 55-60 time frame but ongoing in 63. That’s too early for F4 and Concorde. So it’s Lightning, or Type 188, or TSR2, or maybe a research project. The Bristol Type 188 had a strip indicator, was intended to have a max speed of Mach 2.8 (best speed achievement was 1.8 due to intake problems) and the project was near the end in 63. TSR2 had a maximum speed of Mach 2.25, in 63 reduced to Mach 1.75 by issue 2 of OR.343. Lightening was Mach 2.2 and 63 the project would have been in a significant component delivery phase, so it tops my list of suspects. A un-named research project, possible but unlikely.