From what I'm reading, it doesn't sound like you have installed a PacBrake, but only read about installing one.
From what I'm reading, it sounds like you had a different experience or you are doubting that I installed one.
If you are doubting that isn't easy... ... .
1. Wiring harness runs with other wiring harnesses along rear of engine compartment, wire tied in place.
2. One wire (orange) goes through firewall, hooks to switch in shifter knob (Geno's) and then back to power.
3. Two relays get screwed to inner fender.
4. One wire gets inserted into pin 20 of the engine computer (on left side of engine)
5. Compressor is mounted to plate that is held in place by pax side battery. (wiring harness plugs in)
This completes electrical. - (Total time, including the shifter knob, 2 hours. )
6. Air tank mounts with two bolts. I mounted mine on outside of chassis rail two feet behind the cab.
7. Run air line from tank to compressor.
(Time - 30 minutes)
8. Unbolt turbo exhaust elbow and replace with Pacbrake PRXB Maxflow exhaust brake "elbow" providing 4" instead of 3" outlet.
9. Run air line from exhaust brake to solenoid on compressor.
(time - 30 minutes)
10. Install new 4" MBRP SS exhaust with 5" tip.
(time - 15 minutes to remove old exhaust (sawzall), 1 hour to fit the down pipe and weld the 4" adapter, 1 hour to hang and adjust exhaust. = 2. 25 hours)
Total time 5. 25 hours.
In my book, that is an easy install. I only raised it to a 3 out of 5 in difficulty because there was welding required.
If you doubt that I installed one... here's the "before" post of the brake waiting to be installed.
https://www.turbodieselregister.com...2002/228709-exhaust-pacbrake.html#post2207174