Here is a great little item for telling when to clean (or change) that filter.
Here is the full response to my request for info from DIS:

The Air Filter Restriction Gauge we offer has models for both the gas 20" and diesel 25" all of the info on these can be found on our website at http://www.dieselpage.com/epc.htm

We offer both Direct and Remote mount options $22.50

No Tax on all orders shipped outside of Texas and Oklahoma For shipping charges go to http://www.dieselpage.com/freight.htm
You can place an order or reach us for more information at 1-800-658-9355

Brent Doughty www.dieselpage.com
Diesel Injection Service
Home Office (Lubbock, Tx)

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2000 F-250 Super Duty, SuperCab XLT, Oxford white with medium grey cloth captains chairs, 5.4L Triton V8 (260 HP version!), 4R100 4 Speed Automatic Transmission, 4 wheel ABS, Deluxe Aluminum Wheels, Trailer Towing Package, Class IV Hitch, Reece load distribution system, Escort Sensor II Electronic Brake controller, K&N filter, Sure Stop towing skirt, "Westin" black powder coated step bars, "White-White" head lamps, Herculiner bed liner, ISSPRO Tranny Temp Guage, Excursion center console.




[This message has been edited by cphilip (edited 05-23-2000).]

 

This filter minder thing has been standard on GM trucks for years now, but I don't think it works that well though. I've seen some pretty clogged up filters, and it still said the filter was okay.

 

Yes I think they put them on the Superduty Deisels but I do not know how well they work. If the rubber gromet that fastens them into the box was not tight (old, cracked, etc) they wouldn't work at all. I assume they might wear out eventually. I am going to try one and see.