This is the adapter supplied by Dale and Matt in Canada. [the same guys who do the indexable Avalanche timing gears.] It was designed to fit on the front of the crankshaft to adapt an EDIS toothed gear for crankshaft position and RPM readings....for a distributorless ignition system.

It arrived with two known minor issues:

...the diameter of the hole in the base was slightly too small. It would not fit over the crankshaft hub. Opening up that hole several thousandths of an inch would be required; and was taken care of.

...the outer diameter of the main body of the adapter was too large to fit inside the two piece A/C pulley used on A/C equipped B21FTs and B23FTs. Since the car that this adapter was to be used on was going to have the A/C deleted, that would not be a problem per se. But since the power steering was going to be retained, a third belt pulley would still be required. Fortunately, a solid belt drive pulley intended for use on power steering without A/C would work without any machining required to either the adapter or the pulley.

[Which I found out afterwards was the way the adapter was designed. The adapter was sized for the solid drive belt pulley.]

So what may have been an issue ended up not being any problem at all.

I supplied the required pulley.

A third "issue" would manifest itself as the work and preparations would proceed.

And at this point, I want to clarify something that may be mistaken as a criticism of this EDIS adapter.

It is a very well engineered and machined piece. It was designed and intended for use with an EDIS ignition system.

The fact that I was going to "adapt the adapter" for use with a different ignition system is where the third "issue" arose. If I had been making things for an EDIS system, there would have been no third issue.

Actually, I did not have to modify the adapter. We used it as it was made, and designed and fabricated the piece needed to secure the tec3 toothed gear to the adapter....after resizing the tec3 gear to fit the adapter.

All in all, it came out well. And it was nice to have this adapter to start out with.

[...and the adapter looks a lot better in real life. My photography skills are still deficient; and do not do this item justice.]