The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

woodridge · 05-29-2006, 05:39 PM

My guess on the speedo would be a anti-tamper device used to keep drivers from unhooking the cable and then driving the vehicle for their own use.
Second item is a modulator valve.

05-29-2006, 05:39 PM	#7
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	Re: Ever seen these before? My guess on the speedo would be a anti-tamper device used to keep drivers from unhooking the cable and then driving the vehicle for their own use. Second item is a modulator valve. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet