I am looking for an old data sheet for this panel meter probably 1970's vintage. It is not in the RS catalogue any longer. The nearest component is now supplied by Lascar as a DPM200 but mine is quite different with no obvious way of locally setting the scaling parameters. The other visual difference is that mine does not have the locating slot on the RHS of the pcb.
I used to have a full set of the old RS datasheets but somewhere in a move I must have thrown them away. I found the pinouts here www.scotland.gov.uk/Uploads/Documents/No 29.pdf if that helps.
Thanks again for some really great info. However although there are similarities this is quite different from my panel meter. I might be able to gain enough from all your info to be able to set the scale of mine and power it up effectively. I will let you know. I will also try and get a picture of mine and send it so you will see how different it is.