Check the listing for details. 1985-1991 Corvette C4 L98 MAT Sensor Diagnostic Test Harness Tool. Condition: New. Listed at 28.95 USD. 1985-1991 Corvette C4 L98 MAT Sensor Diagnostic Test Harness Tool 601080 Check your 1985-1991 Corvette Manifold Air Temperature Sensor with a 100% Accuracy. This sensor should be tested regularly to insure the proper fuel mixture is being supplied to your engine. Use these tools with any Digital Volt/Ohm Meter. Your Corvette will idle smoother, enjoy increased horsepower, and gas mileage. Direct Plug In Built In Leads to Eliminate BackprobingFits 1985-1991 L98 Engines Click here for more C4 Electrical! Visit Mid America Motorworks eBay store for Corvettes! We offer over 9,500 Restoration Parts, Performance Upgrades and Personal Accessories for 1953-2023 Corvettes and Corvette Owners. FREE SHIPPING within 48 STATES. If shipping to: Alaska, Hawaii or Puerto Rico please email our eBay Store for a shipping quote. For shipping outside the US please use the eBay Global Shipping program. Thanks for looking!