OK, so I'm late getting back to this..
I'VE BEEN BUSY!
(another movie line, Roger....;p )
I don't believe in fuel into the cab. My opinion, no further comment.
We used Autometer, w/isolator. Isolator mounted as high as possible, on custom bracket utilizing master cylinder studs. Gauge mounted in lowermost a-pillar mounting hole. Yes, it's a pita to feed the ss line thru. At least it was for every one that I've done. I have heard tell of one other person having a better time of it, but I call BS
The connection @ the gauge is -4 AN, as is the connection @ the isolator. You'll need +/- 2' of properly fittinged hose to connect from your take-off port to the isolator. We use ss braid for this also.
With the '99 style cannister, it's easy, as you have (2) 1/4' pipe plugs on top, one pre filter, and one post. You can use either for pressure take-off, or both, and switch them to measure drop across the filter.
The later style cannister involves a bit more creativity. I replaced the line between the cannister outlet and the VP-44 inlet, using-8 ss braid, and AN fittings. Start with a metric to -8 (male) adapter fitting at each, placing the banjo bolts in permanent storage, where they belong. I then added Aeroquip fuel pressure take-off port adapters at each location. You only need one at the cannister bottom for fuel pressure, but I added the other to retain the OEM schraeder valve. (to do this, you'll need Rod's 1/8" pipe schraeder valve) You then use an 1/8" pipe to -4 adapter that threads into the pressure port adapter, and pull your fuel pressure from there at the cannister bottom. Fill in between the cannister and the VP-44 with -8 and the proper fittings, add your pressure line to the isolator, and you're done.
This has worked well for me, your results may vary.