According a good contact on club s12:
"MKI has two plugs on the ECM and MKII has 3 plugs. MKI has vacum dizzy where as MKII has electronic advance. you can't put a MKII ECM in a MKI or vise versa. as for MKII tuning I know a shop that wants to crack the ECM they just need time and an extra ECM...so this is not going to happen anytime soon. My best advice would be to try megasquirt, and blaze new trail. there is also a guide to set a base map for it so that you can limp it to a shop to have it tuned. That is what I would suggest. It is cheap, easy to tune, and works with damn near anything. the only hard part is getting the right info the its ECM. There are tutorials however on their site. Do a Google for MegaSquirt and see what you think"
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