Ecu diagram (honda), H1-a, H3-b – Apex Digital REV SPEED METER 405-A912 User Manual
Page 28: H3-c, H4-b, H4-a, H3-a, H2-a h5-a, H5-b, H6-a

H1-a
18p
20p
16p
H3-b
26p
16p
22p
H3-c
26p
16p
22p
26p
16p
12p
22p
H4-b
20p
14p
H4-a
12p
26p
16p
12p
22p
H3-a
20p
14p
H2-a
H5-a
26p
22p
H5-b
26p
22p
H6-a
31p
16p
32p
ECU Diagram (HONDA)
RPM
Speed
Ground
IG Power
IG Power
Ground
Speed
Ground
IG Power
Speed
RPM
Ground
Speed
Ground
Speed
Speed
Ground
Ground
Speed
Ground
Speed
Speed
Ground
Ground
Speed
RPM
There might not be free space of connector
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