I only tested tachometer and it works great, comes with tachometer wiring. The item “1980-1987 Chevrolet GMC Truck Blazer Silverado Sierra Gauge Working Tachometer” is in sale since Saturday, March 21, 2020. This item is in the category “eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Gauges”. The seller is “79trans-am-guy” and is located in Loveland, Colorado. This item can be …Read more »