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Hi, yes you can delete the EGR and smog pump from the SL. Neither of these systems will affect the engine running. You should check with your state emissions testing office but I don't believe there are any states in the US that require emission testing for a 75 SL.
Let me know if you have any questions.
I think it will probably work fine. I've never converted one but I know a lot of guys use the Megasquirt system to convert from the D-Jetronic system.
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