I'm running a Hondata CPR kit on an OBD2B car with P28 + OBD2B-to-OBD1 ecu jumper installed. My tach worked fine before I installed the CPR kit. After installation my tach doesn't work anymore.

Now as part of the install I had to depin OBD1-A21 and replace it with the corresponding wire from the Hondata harness. In the engine bay side there is a green wire from Hondata harness that normally plugs into the blue wire on the distributor plug. However, since I don't have that blue wire (my car is OBD2B) the tach stopped working. To get it working again I'm told that I need to wire the Hondata harness green wire into OBD2B-A19 to make my tach work again but I'm confused because OBD2B-A19 is technically depinned since it goes to OBD1-A21 which has been physically depinned and replaced.

For reference:
OBD2B-A19 (Engine Speed Pulse) and OBD2B-B13 (ICM) pins converge to OBD1-A21 on the jumper harness
https://www.hondata.com/help/cpr/ind...cpr_wiring.htm

 

FIXED! If anyone was curious on how I remedied the problem:

I took the Hondata green wire from the CPR harness and connected it to the single blue wire on the driver side shock tower. It's not part of the 3 plugs of the engine harness but it is taped from the factory to one of those plugs that sits on the shock tower