is this the right one? sounds the closest to mine ...

"88-91 DX to Si or ZC $ 199
Converts DX, LX, and STD dual point injection to port injection"

or is it the other one
"DX to SiR Conversion Harness

Use this harness in your DX to convert the dual point injection to port injection and also add all the necessary parts for use with DOHC VTEC engines. This harness is designed to be used with the PR3 and PW0 ECU. The harness is two parts, a complete engine harness and a sub-harness from engine to ECU.

Price $249 with exchange of your DX engine harness "

?

is that worth it? That's a lot of change for a wiring harness, i think ...