I see you have the vacuum lock off.
You can bypass the lock off and just run
it off the convertor.
The lock off is only a requirement for indoor use,
for testing purposes you can bypass it.
You should be able to see how that is done.
It is just a matter of removing it and putting the hose
on the converter.
I have rebuilt more than a few convertors, I have come to
my own conclusion on a few of them there seamed to have cracking
in the convertor and it was hit or miss with rebuilding.
I always had a test converter on hand.
Bypass the lock off and see what happens.