{"product_id":"holley-efi-ls-main-harness-to-ls3-map-sensor-adapter-harness","title":"Holley EFI LS Main Harness to LS3 MAP Sensor Adapter Harness","description":"\u003cp\u003eThe \u003cstrong\u003eHolley EFI LS Main Harness to LS3 MAP Sensor Adapter Harness\u003c\/strong\u003e allows Holley EFI LS main harnesses equipped with an \u003cstrong\u003eLS1\/LS2-style MAP sensor connector\u003c\/strong\u003e to be used with an \u003cstrong\u003eLS3-style MAP sensor\u003c\/strong\u003e. This plug-and-play adapter eliminates the need to modify your engine harness when upgrading intake manifolds or changing MAP sensor styles.\u003c\/p\u003e\n\n\u003cp\u003eCommonly used when installing \u003cstrong\u003eHolley LS Hi-Ram intake manifolds\u003c\/strong\u003e, this adapter provides a simple and reliable solution for connecting an LS3 MAP sensor to Holley EFI LS harnesses designed around the earlier LS1\/LS2 connector.\u003c\/p\u003e\n\n\u003ch4\u003eIncludes:\u003c\/h4\u003e\n\n\u003cul\u003e\n\u003cli\u003e(1) Holley EFI LS Main Harness to LS3 MAP Sensor Adapter\u003c\/li\u003e\n\u003cli\u003eFactory-Style Plug-and-Play Connectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHolley EFI\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e558-416\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eHarness Application\u003c\/td\u003e\n\u003ctd\u003eGM LS \/ LSX\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eHarness Type\u003c\/td\u003e\n\u003ctd\u003eAuxiliary Adapter Harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMAP Sensor Adapter Harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eConnector Quantity\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eConnector Color\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eConverts LS1\/LS2 MAP Connector to LS3 MAP Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eHolley EFI LS Main Harness\u003c\/td\u003e\n\u003ctd\u003eLS1 \/ LS2 MAP Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eLS3 MAP Sensor\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eHolley LS Hi-Ram Intake Manifolds\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFitment Notes\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eDesigned for Holley EFI LS main harnesses that use an LS1\/LS2 MAP sensor connector.\u003c\/li\u003e\n\u003cli\u003eConverts the factory LS1\/LS2 connector to accept an LS3-style MAP sensor.\u003c\/li\u003e\n\u003cli\u003eIdeal for LS engine swaps utilizing Holley LS Hi-Ram intake manifolds.\u003c\/li\u003e\n\u003cli\u003eProvides a plug-and-play installation with no cutting or splicing required.\u003c\/li\u003e\n\u003cli\u003eVerify your harness connector and MAP sensor style before ordering.\u003c\/li\u003e\n\u003cli\u003eLegal for sale and use on uncontrolled (non-emissions controlled) vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e\n\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\n\u003cdiv class=\"details-content rte\"\u003e\n\n\u003ch3\u003e1. Why is this adapter needed?\u003c\/h3\u003e\n\n\u003cp\u003eEarly LS1 and LS2 engines use a different MAP sensor connector than LS3 engines. This adapter allows a Holley LS harness built for the earlier connector to plug directly into an LS3-style MAP sensor.\u003c\/p\u003e\n\n\u003ch3\u003e2. Do I have to modify my wiring harness?\u003c\/h3\u003e\n\n\u003cp\u003eNo. This is a plug-and-play adapter designed to eliminate cutting, splicing, or rewiring your existing Holley EFI harness.\u003c\/p\u003e\n\n\u003ch3\u003e3. When is this adapter commonly used?\u003c\/h3\u003e\n\n\u003cp\u003eIt is commonly installed when upgrading to an LS3 MAP sensor or when using Holley LS Hi-Ram intake manifolds that require the LS3-style MAP sensor.\u003c\/p\u003e\n\n\u003ch3\u003e4. Does this adapter change MAP sensor calibration?\u003c\/h3\u003e\n\n\u003cp\u003eNo. The adapter only changes the electrical connector. ECU calibration should always match the MAP sensor installed on the engine.\u003c\/p\u003e\n\n\u003ch3\u003e5. Will this work on any LS swap?\u003c\/h3\u003e\n\n\u003cp\u003eIt will work on LS applications using a Holley EFI LS main harness with an LS1\/LS2 MAP connector and an LS3-style MAP sensor. Always verify connector style before ordering.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003chr\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":56904456798374,"sku":"558-416","price":42.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/558-416-Holley-LS3-MAP-sensor-adapter-1.jpg?v=1785852069","url":"https:\/\/wideopendesign.com\/products\/holley-efi-ls-main-harness-to-ls3-map-sensor-adapter-harness","provider":"Wide Open Design","version":"1.0","type":"link"}