This is a great way to increase x3 the crank signal analysis on your application from 30 degrees/tooth to 10 degrees/tooth. This adapter fits the front cover of 13B/20B engines prior to FD 13B-REW. 
 
In order to install it you will have to drill 2 holes on the front cover's rail, right beneth the oil output.
 
We can supply this as a complete KIT (Adapter plate, trigger disk, sensor (RX8 or REW) and connector)
OR
Just the adapter plate and trigger disk
 
On the trigger disk there is a mark of 5o ATDC for the L1.