No matter the condition of your 1966 Bonneville, OPGI has the Individual Gauges you need to boost performance and get you back on the road. We currently carry 136 Individual Gauges to choose from for your 1966 Bonneville, and our Price Match Guaranteed prices range from as little as $12.99 up to $714.99. OPGI offers Marshall Instruments plus three other trusted brands of Individual Gauges for your 1966 Bonneville, 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 Individual Gauges in person.