Originally Posted by AppleFordParts

They're for more than actual "radio" interference. The interference they're talking about is all the other electronic components in the vehicles. The most dramatic effect I've ever seen personally goes back a ways but it was a Lincoln MkVII in our service drive with a digital dash that was reading 100mph while it was idling in park. It was caused by radio interference caused by the alternator.

-Steve

Originally Posted by 3lowdown

Good info.I wonder if that could be causing my oil pressure gauge to read zero
I put a manual pressure tester on and have plenty of oil pressure, so now I'm wondering if it's either the sender or this suppressor.

Originally Posted by AppleFordParts

The capacitor is a cheap thing to replace as a test.