'87 DD 8V92 readings, sights and sounds

[KimnKim]

Bought my '87 about a year ago and have been re-doing the interior since. We finally completed to the point where we were able to undertake the maiden week long voyage as well as a short follow up weekend. So, with the first couple of drives under my belt, some relavance to a few baseline numbers would be appreciated from those of you whom have been soldiering with this workhorse engine for oh so many years. Ranges of some of the categories I was able to glean from the Detroit manual, but others I'm just not sure about.

Pyrometer temp ranged between 400 and 600 degrees (the later during a mountain pass climb). Transmission oil temp 180 - 195 degrees. Brake and coach air climbed to about 135 lbs. after several minutes at highway speed and pretty much lived there until we arrived back in the city (and into traffic again)...is this one high? The sneezer seems to be much less active on the highway than in city driving and I believe it sneezes at about 125 lbs. in city driving circumstances.

Also had an audible warning that seemed to be related to the air system, but not a low air warning. That alert, in my coach, is an after market buzzer that seems to work just fine (buzzes until 70 lbs are achieved). This warning is a chime that sounds much like sonar 'pings'. Had it not been for the need to activate the air horn, which triggered the end of the annoying alarm, it likely would have been a long while until I was able to narrow it to the air system, as this alarm is very intermittent. Could this be an excessive air alarm?