I haven't taken the cap off the mirrors yet... I think other have in this thread... I'd be interested in how to do that too... I bought these off ebay...
https://www.ebay.com/itm/144054719101
and... NM = Never mind lol
I installed it inline with the boost pressure line inside the cab after it comes through the firewall. It basically eliminates any vacuum pressure fluctuations you can have from the manifold.
Here's some more info:
https://forums.nasioc.com/forums/showthread.php?t=2342679
Also.. to get rid of the needle from vibrating on vacuum I had to install an inline boost pressure restrictor. Similar to this one below... its basically a tube with a pin hole inside of it...
IMO, I like the vent pod as it still functions. But the dash tray I also considered. I was also leery about tearing into the A-Pillar. I'm sure many other vehicles have but its just something else to work around.
HN Customs in Australia is currently making them. They already have them for RH drive Rangers. They'd probably expedite some orders if you ask. You can look them up on fb or instagram and I got a response on fb in less than a day.