The kit also includes: a wiring harness, push-button calibration for ease of setup, and built-in ECM signal filter switch to remove signal noise for smoother speedometer operation. Save space with Classic Instruments’ Zeus Speedometer Technology built-in, meaning the cluster requires no external control boxes and works directly with ECM or VSS signals. The fuel gauge is programmable for many ohm ranges with a selector switch on the back of the cluster, meaning the fuel gauge will work with the stock sending unit, any other factory sending units, or any Classic Instruments fuel sending unit. All other necessary sending units are included in a Classic Instruments GM sending unit kit. Zeus-Link is available for separate purchase for a direct connection to GM and Holley ECUs. Install using customers’ existing diffuser and lens. This new ’88-’94 OBS Chevy truck cluster from Classic Instruments is proudly made in the USA and can be purchased direct or through any one of its authorized dealers or at holley.com. This new 1988-1994 OBS Chevy truck cluster from Classic Instruments is proudly made in the USA. Zeus speedometer technology, all electric, no external boxes, hybrid lighting, shift light and check engine, single connector, molded housing, made in USA, push button calibration, programmable fuel gauge. SN73Z-GM Zeus Link can be added to any OBS cluster to operate from vehicle can bus. Classic Instruments all new 1988–’94 OBS Chevy Truck direct-fit package. It is an all-electric cluster featuring a speedometer, tachometer, fuel, oil, temp, and volt gauges in an OE style, available either with or without a window to view the gear position indicator. It also features a digital OLED odometer with trip meter and optional digital speed readout. Hybrid LED Lighting offers the feel of the original perimeter lighting and the visual benefits of back-lighting: even illumination and clear nighttime readability. Additional light features include check engine, high beam, shift lights, and integrated LED dimmer.