Since we religiously use restriction gauges on the truck fleet, I put one on the 86. First dont be suprised if the sintered bronze safety filter in the port for the gauge is plugged. After resolving that I found out that even after 6 months, the restriction gauge either never moved or moved one click. I live on dirt road and drove around a landfill a lot. So I dont worry about a filter minder, they are great, work on a lot of things but not on these pickups.