Airspeed Oxford Cylinder Head Instrument

The cause of all this trouble is I have the copilots panel,and
it appears that they were all made for the bigger boost and cylinder
head gauges.
What they then did, was cut / hack, the webbing between the two gauges.
From period photos,a couple of flat plates to hold both boost and both
cylinderhead gauges, bolted at either end.
Here is the rub,the boost gauge plate is smaller (as the early boost type
is a unique size!)the cylinderhead temp gauges the normal3 1/4.
Your idea of a plate/adaptor thread is a good one.
Thanks for your help.
Cheers Mike

Mike you could be right on that one.
I can not find the actual document where it states it in black or white but my database says that 6A/700 is an adapter plate used “for fitting a Mk3 where a Mk 2 was”. Given that 6A/699 and 6A/701 are both MKIIIc boost gauges, I would say that this is the adapter you require for boost gauges.

However we know that is not what you wish to achieve on this occasion.

It is a pity that there are no drawings available of these adapter plates. It is the sort of thing that once you have the drawing in electronic format, you just send out to a suitable engineering company and they cut it out for you in seconds. Other than installing the captive nuts and painting the adapter, its not that hard to do. I think I will start a thread on this subject.

Thanks for the information,I have most of that except,
for the adaptor plate,I have 6a/700 which does not fit,
but I beleive it was used to update from the old, LARGER
STYLE boost gauges to the newer small versions.
Are you able to confirm it was suitable for the Oxford?
Regards Mike

These are both described as being Engine cylinder thermometer, Mk I.
The Weston type A indicator, model E602 was supersed by the Ferranti indicator. The Ferranti indicator has the reference number 6A/620.
When installing the Ferranti in lieu of the Weston an adapter plate was used (6A/722).