Hi,
With...
Type : [index1[0]:temperature:1:0]
Instance label: 1.3.6.1.4.1.25506.2.6.1.1.1.1.12
...it works for me, I can select instance 92 from the list.
The above is hard to work with when using IRF stacks tho, I found the below makes it easier - it renames the instance numbers to the irf member IDs.
Name: <any name>
Type: [index1[0]:StackMember:1:0]
Instance Label (definition OID): 1.3.6.1.4.1.25506.2.91.3.1.2
Formula:1.3.6.1.4.1.25506.2.6.1.1.1.1.12
... if you're interested, you can get the names of all the instances shown under 1.3.6.1.4.1.25506.2.6.1.1.1.1.12 and what they relate to, by using the entity-MIB as the instance label, as below
Name: <any name>
Type: [index1[0]:Temperature:1:0]
Instance Label (definition OID): 1.3.6.1.2.1.47.1.1.1.1.7
Formula:1.3.6.1.4.1.25506.2.6.1.1.1.1.12
instance 92 (1.3.6.1.4.1.25506.2.6.1.1.1.1.12.92) shows up as temperature::board - since HP A switches refer to themselves as 'boards' on the cli