That's what I did, typed the instructions into google translate and that gave me enough to install.
My version didn't have the led as I'm using the asiatam recoil unit which has it's own, but as far as I know all arm models have only 3 wires to install not including the led wiring. Green to the board and 2 to the switch.

This is what I got from google translate;
1. When you Ersted "verify the Heng Long board. This module works only with the RX14 and RX18 Heng Long board
2. They are nearest point to Program 3. Please look at the picture good and they explore the cables and the right places.
3. Plumb 1: Ground (black cable) best to the main switch.
Plumb 2: Signal (green cable) It is the third nearest point to the left of the small Heng Long board (see picture). Please make
sure that there is no short circuit.
Plumb 3: Plus 7.2 volt (red wire) is also at the main switch.

The red wire of the left engine cut. Then the cable to the terminal screws 1a and 1b. Doing the same thing they now motor cable
with the right red, but these screws to the terminal 2a and 2b.
and they're ready.