‘’A proper vacuum gauge is very inexpensive and a valuable diagnostic tool.
The first Vacuum test to do is:
Find a place to connect the gauge directly into the intake.
Have the car fully warmed up:
Let the car just Idle (I believe you Brits call it tick over)
Record the reading and very importantly the action of the needle if any.
Ideal reading is 18-22 in.hg with a rock steady needle.
Watch the gauge for several minutes at idle look for any changes in reading or needle action’’
Guys I’ve read your other posts like ‘car dies’ but can’t work out where I’m meant to be connecting for the vacuum test. Might you post a pic of an arrow pointing to the location of it in the engine bay please?
Threaded Mode
