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No doubt, I'm not going to be buying the ebay unit... besides I already know that it doesn't do what I want which is to step-up the output from the MAF...
I believe it's your charcoal canister but may b wrong
That box from eBay probably has 2 potentiometer and a switch. Id look at the reviews, specs, and instructions before spending $40 on $5 worth of parts.
... and this circuit does the same thing, but only uses 1 stage.. (non-inverting op amp)...
R1 and R2 would be switched out for regular
Looks good man