From The Saab Tech Wiki
The revision and date of manufacture are printed on the IDM label. I this case, 1999 week 20, revision TK3.2E. The date code indicates the rough age of the cassette, which allows the mileage to be estimated. Most ignition cassettes do not last over 100k miles.
== Spark Plug Boots ===
Before reassembly, the plugs and/or the end of the rubber boots should be coated with a thin layer of dielectric grease.
=== Installation ===
Seat the module over the plugs carefully, then press down to fit the boots on the plugs. Tighten the screws to about 8 lb-ft, and replace the connector. Check the screws a few days later to make sure they are still tight. If loose, reassemble with blue Loctite or lock washers.