Adding a diagnostic port.....

[Joe Bob]

Has anyone added a diagnostic port (OBD) to a conversion?

I have a 91 3.6 in my SC and I have nothing else to do but waste time and source used parts.

[Joe Bob]

So no one has done this?

[Lorenfb]

It will not require much effort other than getting the 964 round connector
and connecting it to the DME ECM. All that's needed is to connector four
wires, i.e. ground, +12, and K & L lines, since communication with just
the ECM is needed. Most of the Porsche junk yards should have the connector
for a low price as there isn't much of a demand. One could also hookup
the CEL too which would be nice to have.

[Joe Bob]

OK, what would involve adding a check engine light besides having an extra idiot light in the dash?