If I can add something--
The after crimp stem diameter of the -3 hose end is .079. Those that have used this setup, and on the original brazed tee we used to make, did not report any pulse anomalies so we left it as is. Yes, we can further restrict the orifice diameter if need be.
The question was asked why we changed from the brazed tee to the 'fitting'version. Well, honestly, making the brazed tee is labor intensive. Some clients had 1 PMag, some had 2, and some with 1, decided to add a 2nd one. With the brazed tee crimped inline, we would have to take that hose, cut out the single tee, add the dual port version, recrimp and return the hose. With the new 'fitting'version, using AN hose ends, its a simple matter of unscrewing the tee and replacing it with the dual port version. The outlet hose to the MAP sensor generally has enough slack that the extra length in the sender hose would matter.
One other thing---YES we have on some versions use teflon hose from the tee to the PMags. Since the tube on the PMag is sized for the vacuum hose included with the PMags, we decided to make a tube stub fitting that crimps on our teflon hose, and uses a short piece of the PMag hose for the connection. Gee--why would be do that? Well, some clients actually like the look of the braided hose, and weren't concerned over a few extra ounces of weight; the differences between the braided hose, and the vacuum hose. ( I guess if we had a PMag we could come up with a more improved version of this.) Yes, its does take alittle extra effort to remove the hose, and blow into it to set the timing, instead of just pulling off the vacuum hose.
One downside of this is it IS more expensive to use the teflon hose instead of the rubber vacuum hose for this system. Some of our clients have spent +-$2500 for the 2 PMags and WANTED something functional AND looked good. Another reason we changed to the 'fitting' version.
For you weight conscious builders--YEP plastic tees are available from most auto parts stores (Edelmann makes a large variety) for use with vacuum or plastic hose. Remember the plastic tees we had on our street cars in the early days? Yep they eventually break due to heat and cold----and some of you 'like' to fly in cold weather. Something to think about--as well as plastic in a FWF area. But with regular maintenance, its probably acceptable. NOT starting a flame war here!!
Tom