Megasquirt MS3 Pro Evo Flying Lead (TXL, Color)

v3 · public
Owner yourspec
Wires 65
Length 390'
Updated Aug 14, 2025

Project Description

This project is a flying lead harness for the Megasquirt MS3 Pro Evo. All wire lengths are 8 feet and TXL. Pins are labeled with connector number and position, A = white connector B = grey connector. Dual use pins are both populated so you should delete the wires you do not plan to use (digital freq 3 and 1)! 

You can copy this project to make changes for your specific project!
Total
$266.01
Wire Marking Wire End 1 Wire End 2
# Qty Name Wire Type Wire Gauge Wire Color Length Mark Text Interval Strip Length Tail Tinning Pin Crimped Connector Strip Length Tail Tinning Pin Crimped Connector
1 1 High current output 1 TXL 16 AWG Violet8' 0" A1 - HCO 1 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2 1 High current output 2 TXL 16 AWG Violet8' 0" A2 - HCO 2 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
3 1 Injector J TXL 18 AWG Blue8' 0" A3 - INJ J 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
4 1 Injector I TXL 18 AWG Blue8' 0" A4 - INJ I 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
5 1 High current output 3 TXL 16 AWG Violet8' 0" A5 - HCO 3 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
6 1 Primary trigger 3 Conductor Shielded Tefzel (M27500-22SB3T23) 22 AWG White8' 0" A6 A15 - PRIMARY TRIGGER + 2.00" 45.000mm
1-WHITE Primary trigger-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Primary trigger-2 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
3-ORANGE Primary trigger-3
SHIELD Primary trigger-5
7 1 Knock 2 2 Conductor Shielded Tefzel (M27500-22SB2T23) 22 AWG White8' 0" A7 - KNOCK 2 2.00" 45.000mm
1-WHITE Knock 2-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Knock 2-2
SHIELD Knock 2-3
8 1 +5v sensor supply TXL 22 AWG Orange8' 0" A8 - +5V 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
9 1 Throttle position sensor TXL 22 AWG White8' 0" A9 - TPS 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
10 1 Manifold air temperature sensor TXL 22 AWG White8' 0" A10 - MAT 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
11 1 Coolant temperature sensor TXL 22 AWG White8' 0" A11 - CLT 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
12 1 Analog input 6 TXL 22 AWG White8' 0" A12 - ANALOG 6 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
13 1 ECU ground TXL 16 AWG Black8' 0" A13 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
14 1 PWM idle control TXL 18 AWG Violet8' 0" A14 - PWM IDLE 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
15 1 ECU logic ground TXL 16 AWG Black8' 0" A16 - ECU LOGIC GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
16 1 Analog input 7 TXL 22 AWG White8' 0" A17 - ANALOG 7 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
17 1 Sensor ground TXL 22 AWG Black8' 0" A18 - SENSOR GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
18 1 Analog input 1 TXL 22 AWG White8' 0" A19 - ANALOG 1 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
19 1 Analog input 2 TXL 22 AWG White8' 0" A20 - ANALOG 2 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
20 1 Analog input 3 TXL 22 AWG White8' 0" A21 - ANALOG 3 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
21 1 Analog input 4 TXL 22 AWG White8' 0" A22 - ANALOG 4 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
22 1 Analog input 5 TXL 22 AWG White8' 0" A23 - ANALOG 5 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
23 1 Tach output TXL 22 AWG Violet8' 0" A24 - TACH 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
24 1 WBO input TXL 22 AWG Gray8' 0" A25 - WBO 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
25 1 Secondary trigger 2 Conductor Shielded Tefzel (M27500-22SB2T23) 22 AWG White8' 0" A26 - SECONDARY TRIGGER 2.00" 45.000mm
1-WHITE Secondary trigger-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Secondary trigger-2
SHIELD Secondary trigger-3
26 1 Fuel pump relay trigger TXL 20 AWG Violet8' 0" A28 - FUEL PUMP RELAY 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
27 1 PWM output 2 TXL 20 AWG Violet8' 0" A29 - PWM 2 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
28 1 PWM output 3 TXL 20 AWG Violet8' 0" A30 - PWM 3 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
29 1 Knock sensor 1 2 Conductor Shielded Tefzel (M27500-22SB2T23) 22 AWG White8' 0" A31 - KNOCK 1 2.00" 45.000mm
1-WHITE Knock sensor 1-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Knock sensor 1-2
SHIELD Knock sensor 1-3
30 1 CAN L TXL 22 AWG Green8' 0" A33 - CAN L 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
31 1 CAN H TXL 22 AWG White8' 0" A34 - CAN H 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
32 1 ECU switched power TXL 16 AWG Red8' 0" A35 - +12V ECU PWR 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
33 1 Injector A TXL 18 AWG Blue8' 0" B1 - INJ A 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
34 1 Injector B TXL 18 AWG Blue8' 0" B2 - INJ B 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
35 1 ECU Ground TXL 16 AWG Black8' 0" B3 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
36 1 Injector C TXL 18 AWG Blue8' 0" B4 - INJ C 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
37 1 ECU Ground TXL 16 AWG Black8' 0" B5 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
38 1 Injector D TXL 18 AWG Blue8' 0" B6 - INJ D 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
39 1 ECU Ground TXL 16 AWG Black8' 0" B7 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
40 1 Injector E TXL 18 AWG Blue8' 0" B8 - INJ E 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
41 1 ECU Ground TXL 16 AWG Black8' 0" B9 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
42 1 Injector F TXL 18 AWG Blue8' 0" B10 - INJ F 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
43 1 Injector G TXL 20 AWG Blue8' 0" B11 - INJ G 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
44 1 Injector H TXL 18 AWG Blue8' 0" B12 - INJ H 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
45 1 Ignition G TXL 18 AWG Yellow8' 0" B13 - IGN G 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
46 1 Ignition E TXL 18 AWG Yellow8' 0" B14 - IGN E 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
47 1 Ignition C TXL 18 AWG Yellow8' 0" B15 - IGN C 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
48 1 Ignition H TXL 18 AWG Yellow8' 0" B16 - IGN H 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
49 1 Digital frequency input 2 TXL 22 AWG Green8' 0" B17 - DIGITAL FREQ IN 2 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
50 1 ECU Ground TXL 16 AWG Black8' 0" B18 - ECU GND 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
51 1 Digital switched input TXL 22 AWG Green8' 0" B19 - DIGITAL SW IN 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
52 1 Digital switched input 2 TXL 22 AWG Green8' 0" B20 - DIGITAL SW IN 2 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
53 1 Digital frequency input 3 TXL 22 AWG Green8' 0" B21 - DIGITAL FREQ IN 3 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
54 1 Digital frequency input 3 VR 2 Conductor Shielded Tefzel (M27500-22SB2T23) 22 AWG White8' 0" B22 B23 - DIGITAL FREQ IN 3 VR 2.00" 45.000mm
1-WHITE Digital frequency input 3 VR-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Digital frequency input 3 VR-2 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
SHIELD Digital frequency input 3 VR-3
55 1 Ignition F TXL 18 AWG Yellow8' 0" B24 - IGN F 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
56 1 Ignition B TXL 18 AWG Yellow8' 0" B25 - IGN B 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
57 1 Ignition D TXL 18 AWG Yellow8' 0" B26 - IGN D 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
58 1 Ignition A TXL 18 AWG Yellow8' 0" B27 - IGN A 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
59 1 Digital frequency input 1 TXL 22 AWG Green8' 0" B28 - DIGITAL FREQ IN 1 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
60 1 Digital switched input 3 TXL 22 AWG Green8' 0" B29 - DIGITAL SW IN 3 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
61 1 Stepper IAC 1B TXL 20 AWG White8' 0" B30 - IAC 1B 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
62 1 Stepper IAC 1A TXL 20 AWG White8' 0" B31 - IAC 1A 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
63 1 Stepper IAC 2A TXL 20 AWG White8' 0" B32 - IAC 2A 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
64 1 Stepper IAC 2B TXL 20 AWG White8' 0" B33 - IAC 2B 2.00" 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
65 1 Digital frequency in 1 (VR) 2 Conductor Shielded Tefzel (M27500-22SB2T23) 22 AWG White8' 0" B34 B35 - DIGITAL FREQ IN 1 VR 2.00" 45.000mm
1-WHITE Digital frequency in 1 (VR)-1 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
2-BLUE Digital frequency in 1 (VR)-2 5.100mm AMPSEAL 1.3 (Tin, 770854-1)
SHIELD Digital frequency in 1 (VR)-3
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