I_AM_ZHOUL!!!, I meant to ask you for awhile now; Why do you keep using "!!!" and "???" in your posts? It give most your posts a very hostile tone.
What part of "works in the same way as Olfactory Booster cyberware" confuses you???
The crunch you are talking about is this sentence:
SR5 p. 452 Olfactory Booster
Add the booster’s rating as a dice pool modifier to your scent-based Perception TestsYou have a solid argument that it will add the booster’s rating as a dice pool modifier to your scent-based Perception Tests, just like the chrome version.
What Jack_Spade is saying is that there are general rules for using a sensor. The Olfactory Scanner is not something you put on your nose, you might as well place it on the back of your hand or in your belt. Its a sensor.
As always in SR5 rules are spread out all over the book. The Olfactory Scanner is described briefly on p. 446 but more in detail on p. 365 and also under Olfactory Booster on p. 452. There are also some rules for them under Gas Delivery Systems on p. 366.
Sensor Rules are unnecessary complex and to be honest it is one part of the rules I'm not fully up to date on; but on p. 445 there is an interesting notation about Sensor Arrays that might or might not be relevant for this topic.
SR5 p. 445 Sensors
When you use the sensor array for Perception Tests, you may use your Electronic Warfare skill in place of your Perception skill, and you may use the sensor's Rating as your limit. If this does not apply (because we are talking about a single sensor and not a sensor array or what not) then we need to go back to the rules in the combat chapter.
SR5 p. 184 Sensor Attacks
To detect a person, critter, or vehicle with sensors, the character/vehicle must make a successful Sensor Test. Characters roll Perception + Intuition [Sensor]Together with:
SR5 p. 452 Olfactory Booster
Add the booster’s rating as a dice pool modifier to your scent-based Perception TestsTo detect explosives or ammunition rather than a person, critter, or vehicle you follow rules on p. 365
SR5 p. 365 Olfactory Scanner
Also known as chemical detector systems or chemsniffers, analyse molecules in the air for nitrogen-rich particles like those given off by explosives or firearm ammunition. To detect explosives or ammunition, roll a dice pool equal to the chemsniffer's rating against a threshold of 2 (3 if the explosives/ammo are hermetically sealed). Apply modifiers as noted on the Chemical Detection Modifiers table. To detect the difference between a metahuman and an animal or pinpoint gender you use the rules on p. 366
SR5 p. 366 Olfactory Sensor
...In order to pick up a scent, the scanner rolls its Device Rating against a threshold of 3 (2 for characters with tailored pheromone bioware). It can also be used to detect gas;
SR5 p. 366 Gas Delivery System
...The gamemaster may secretly conduct Perception Tests to see if any characters notice the gas, basing the threshold on how noticeable the gas is (many gases are colorless and odorless). Characters equipped with an Olfactory Scanner (see p. 452) may be alerted by their gear.