This Wiring Specialties PRO Series harness was designed from the ground-up to exceed OEM specifications for wire quality, power/ground routing.

Looking for the best in aesthetics, weight savings and reliability out of your harness?  Our Pro Series harness completely replaces your old OEM harness so you can forget about those electrical gremlins.

This harness is specifically engineered for a USDM LHD FD Mazda RX7 (93-95) with the LSx engine swap. It was developed in house on an actual LS1 engine in a FD chassis to ensure a perfect fit to all engine sensors. With our simplistic and 'tucked' approach the end result will be a clean and worry free installation with a guaranteed start up​.​

Wiring Specialties offers a number of options for common performance upgrades for this product.  Build your perfect harness by selecting from the available options to the right​ and as always if you have any questions reach out to us.

Engine: Gen 3 Drive by Cable LS1/Vortec

• Any F-body LS1 from  1999-2002 Pontiac Trans Am, Camaro SS
• Any LS1 from  2004 Pontiac GTO
• Any Truck/SUV LSx/Vortec from 1999-2004 Silverado, Suburban, Tahoe, etc.

Chassis: LHD USDM FD Mazda RX7

• Any USDM LHD Mazda RX7 manufactured in 1993-1995
• Retains factory speedometer, tachometer, CEL, engine temperature gauge (requires Mazda sensor install), oil pressure sensor (requires Mazda sensor install), alternator charge light, reverse lights and wipers)

RX7 SPECIFIC ITEMS

• Plug and play features of this harness require the OEM RX7 body harness and fuse boxes to be UNMODIFIED. The harness utilizes the HIGH pressure OEM Mazda fuel pump relay, so it needs to remain on the chassis fuse box, unmodified.
• Harness includes two accessories fan circuits, with relays and fuses for PCM controlled operation.
• Harness kit includes a bypass switch to allow the use of RX7’s High Pressure fuel pump.
• For proper ECT gauge functionality the RX7 ECT sensor must be installed in the OEM sensor opening on Bank 2 (cylinder 7) location on the LS. This is the 1-wire sending unit, NOT the 2-wire and it will require the use of an adapter fitting. Harness connection will be provided at bank 2 rear of the head location.
• For proper Oil Pressure gauge function, the RX7 OEM oil pressure sending unit needs to be used. In most cases a relocation line needs to be used in order to use the Mazda sensor with the swap. Harness connection will be provided to reach the passenger side shock tower for sensor relocation
• For accurate Speedo operation, the frequency modulator SGI5 must be used.
• Mazda Fuse box connectors are integrated into the Wiring Specialties LS harness and included in the kit. No core needed for a full plug and play install.
• Charge cable included in the kit ONLY. Battery cable is not included.
• A/C option is available as a custom feature. Please inquire with our sales team about pricing

INCLUDED WITH THIS PRO-SERIES HARNESS

• Main Engine and Transmission one-piece tucked harness
• 8x Injector connections
• Knock sensor sub-harness connector
• 2x Fan connectors, for fans controlled by the PCM
• Alternator charge cable built into the main harness
• 3-wire or 5-wire MAFS connector
• Intake Air Temp connector
• TPS connector
• Idle Air connector
• ECT sensor connector and cluster coolant temp switch connector
• Oil Pressure gauge connector
• Bank 1 and Bank 2 Coil interface connectors (coil harnesses are optional)
• Cam sensor connector
• Map sensor connector
• Crank sensor connector
• Bank 1 and Bank 2 FRONT Oxygen sensor connectors (High Temp shielding)
• 1x ground ring terminal
• Reverse lights sensor connector
• Speed sensor connector
• Reverse lockout connector
• Skip Shift solenoid connector
• Alternator connector
• Starter signal/start connector
• OBDII communication connector
• Printable install instructions with pictures
• Turn Key ENGINE START Guarantee
• Tech support for our customers 7 days a week 

PRO-SERIES HARNESS TECHNICAL SPECS

• Plug and Play – simple and efficient
• NO CORE HARNESS or additional wiring required
• OEM wire colors used, where applicable
• Fireproof fiberglass sleeving used in high-temp sections near the manifold & turbo (-40°C/-40°F to +450°C/+845°F operating temperature)
• Point-to-Point continuity tested on every wire
• Constructed using exact OEM connectors and seals
• Made with high temp TXL wire with adhesive shrink tubing (-40°C/-40°F to +125°C/+257°F operating temperature)
• Wrapped in lightweight nylon loom (-94°C/-137°F to +125°C/+257°F operating temperature)
• Includes a charge harness and improved grounds
• Fully tested after production for an easy plug-and-play installation

Sikky Swap Kit Fitment Notes

• Requires no modifications to the factory cross member or subframe and does not hang below the crossmember when installed
• Requires clearancing on the firewall to allow for ideal fitment. This kit is designed to pull the engine as far back as possible in the engine bay to allow for ideal weight distribution and to be able to retain the factory front suspension. Unlike our competitors, we believe the RX7 should retain as close to 50/50 weight distribution as possible like it did from the factory.
• Designed to work in a left hand drive vehicle. It can be used in a right hand drive vehicle with some modification (however we do not supply the components to make this a bolt in application). Please contact our sales staff for information in regards to this.
• Transmission and Shifter – This kit is designed to work with the LS1 style T56 transmission. We designed this kit to allow for the shifter to locate in the factory location for easy operation, without the need for a shifter relocation kit. 

Sikky Stage 3 Package Includes

 Aluminum Race Oil Pan 

• Designed to fit perfectly around the front sub frame of the FD Mazda RX7 when using Sikky mounts
• High capacity 5 1/2” deep front sump design with side kick outs for maximum oil capacity
• 1/2” thick CNC machined 6061 Billet Aluminum Flange and back plate
• Machined gasket surface to ensure no gasket leaks
• Rigid design like the OEM GM pan to ensure maximum strength and durability
• Included back plate compatible with factory dust covers to prevent debris entering the bell housing
• High ground clearance design keeps the pan from hanging out the bottom of the car
• High capacity 6 quart sump (does not include oil filter or oil filter relocation)
• Comes with pan mounted bottom port remote oil filter adapter, magnetic drain plug and hardware Kit (utilizes some factory hardware not included)
• F-Body Camaro Pickup Tube and oil pan gasket sold separately
  

 Remote mount filter Kit 

• -10 AN Fittings (4) and Stainless Braided Lines (2)
• Remote Oil Filter Base
• High Quality Oil Filter
• All Fittings and Hardware

 Engine Mounts 

• CAD/CAM Designed CNC Machined Solid 6061 T-6 Aluminum Mounts
• Custom Urethane Bushings with True Isolation
• High Grade Hardware Kit
• Proper Engine Placement and Axle Alignment
• Lifetime Warranty on Engine Mounts

 Trans Mount 

• CAD/CAM Designed CNC Machined Solid 6061 T-6 Aluminum Mount
• CNC Bent Steel Mount Bracket
• Urethane Bushing
• High Grade Hardware Kit
• Designed for use with the T56 or T56 Magnum
• Lifetime Warranty on Transmission Mount

 Driveshaft  

• Steel One Piece Driveshaft with High Strength 1310 U-joints (aluminum upgrade available)
• Designed for Use with the T56/T56 Magnum or 4l60e Transmission

 PRO Series Headers 

• The only long tubes available on the market that will fit this application.
• Mazda FD RX7 1 7/8″ Primaries, 3″ Collector, Stainless Steel
• V-Band Flange Pre-Installed (clamp and other half included)
• Includes New Gaskets and Bolts

 Power Steering Lines

• Available for LS1, LS2 or LS3 Style Power Steering Pumps
• Includes High and Low Pressure Lines and clamps
• Fits LHD chassis only

 *This page was updated June 13, 2022 with the latest info directly from SIKKYs website.  Part specs & prices are subject to change.