Any progress on V8 engine swap options?

[78F350]

I'm pretty sure that the tach signal is not from the sensor, but converted within the ECU. On the 7.2 ECU it is, but I don't have any reference handy for a '98/2.5L harness. There was some discussion with the LS swaps between John and VLad using a converter. Some of that is here: V8 Conversion

If I remember and have time, I'll track it down for you.

[78F350]

From the 986 Factory Service Manual, Audi A6 (C5) Bentley and a few old spreadsheets I made, here's a simplified diagram:


That's from the 1998 Boxster and 40 valve AWN engine A6. The 32 valve V8s will have a different ECM pinout, but I have that filed somewhere too if it's needed.
That same signal should also be run to pin 9 of the OBD port.

I have not tried it yet. I'm curious if the signal output by the Audi ECM is identical to the one put out by the Boxster's DME. I expect that it will work and not make smoke come out of the cluster.