Here ya go:
start with this: (#1)
http://www.gbodyparts.com/product_info.php?products_id=532&osCsid=86ce1f11bf978bfb7175805941ad072c
then attach this piece & screw a gauge (or 1/8" npt male item) directly into it:
http://www.gbodyparts.com/product_info.php?products_id=547&osCsid=86ce1f11bf978bfb7175805941ad072c
just FYI, -4AN fittings attach to the 1st piece above equally as well!
(in case you're using multiple items like pressure gauges & transducers, etc.)
another option:
http://www.kirbanperformance.com/product/111/EFI FUEL PRESSURE MECHANICAL GAUGE KIT #6629.html
or use this route for multiple devices/sending units:
~ start with #1 above (
http://www.gbodyparts.com/product_info.php?products_id=532&osCsid=86ce1f11bf978bfb7175805941ad072c )
~ get a 4AN 'Tee' & connect to either side of (#1) above (
http://www.jegs.com/i/Earl's/361/926104/10002/-1 )
~ add 2 of these {4an female coupler} to the above Tee (
http://www.jegs.com/i/JEGS Performance Products/555/100321/10002/-1 )
~ get 2 of these {4an male to 1/8" npt male} & attach to above coupler (
http://www.jegs.com/i/Aeroquip/023/FCM2721/10002/-1 )
~ then attach your 2 units
there is NO easier way to attach multiple pressure units, I spent hours looking for a simpler method & there really isn't one!
of course, they say you shouldn't place sending units or transducers directly on the engine because of vibration (they may shake loose!), so you could always use a -4AN braided hose & mount remotely, thats what I did!
(#1 above, with the kirban gauge unit attached on top side, & then a 4an 90* fitting with hose on the front, other end: 4an straight on hose end, to: a Tee, then the straight 4an couplers, 4an to 1/8" adapters, then finally the units).
Kind of a large setup, but whatya gonna do when you need a fuel pressure gauge on the rail, a transducer plus a sending unit! whatever, but everything works!
View attachment 156313
View attachment 156314