No matter the condition of your 1978 Eldorado, OPGI has the Gauges & Accessories you need to boost performance and get you back on the road. We currently carry 192 Gauges & Accessories to choose from for your 1978 Eldorado, and our Price Match Guaranteed prices range from as little as $4.25 up to $1,292.99. OPGI offers Marshall Instruments plus nine other trusted brands of Gauges & Accessories for your 1978 Eldorado, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Gauges & Accessories in person.