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Yo OS. Thought I'd post up here as it's the last electrical issue with my engine swap and I genuinely do not see an easy fix. I've done the entire swap and everything is tickety-boo generally. The car before the swap was a GX61 Cresta Super Lucent: 1G-EU (AFM) and factory W57 5 speed. I swapped into it a 1G-GEU (MAP) bluetop from an automatic GA70 Supra. I retained the W57 As I've wired the check engine lamp correctly, I can get error codes (yay). The issue I have is the car throws a code 42 which is: The symptoms for code 42 are a forced limp mode after ~4000 rpm (can feel it cutting fuel), not good. To me, this makes sense as the factory 1G-EU ECU does NOT have a ECU pin for "SPD". Clearly, there is an open circuit for the pin SPD which feeds the ECU a signal telling the ECU how fact the car is moving. in a 1G-GEU, the pin: "SPD" receives an electrical signal from the dash cluster I believe. My question is, without SPD in the 1G-GEU ECU getting a signal from the dash cluster, is there anyway to prevent it tripping a code 42? I've done some basic trouble shooting such as: Grounding SPD pin (obviously a fail); checking the factory GX61 dash harness plug to engine harness for extra pins which may be SPD (to no avail). Has anyone had experience with swapping a car that required an electric speed signal to the ECU where the factory dash loom did not have the provision for it?