It depends on stock ECU program condition, but basically there is no influence. There was no case of engine failure because of the SLD usage.

It’s about switch in the SLD. SLD has to set the right switch for the your automobiles.

If you set the switch after IG-ON, the setting might not be executed. Please make it IG-OFF and try again.

Please check the wire settings of solenoid A and solenoid B, if it's ok, it might be the swtich's setting. Please check for these settings again.

For some cars, ECU is in the engine compartment. Please check the manual and do the wiring to the ECU.

Please set in the ECU box with the double sided tape. If you put the device inside the ECU box, the high temperature will not be any problem.

Yes you can. Please follow the traffic rule and drive safely on the road.

1. For SLD type I/II
The stock meter will display as much as it can. For installing a retrofit, please wire with sky blue color wire if there is one, and if not please wire to the white color line.

2. For SLD type III
It will only display from about 170 to 175km/h for SUBARU cars and the retrofit meter type which uses CAN communication signal such as OBD II for vehicle speed display. Also, if you connect the CAC or turbo timer to the speed signal wire of the option coupler or navigation, it will display 180 km/h over (including SUBARU).

Please connect SLD between the posiotion where the navigation is wired and ECU.

1. If the meter is not working;
Probably the vehicle speed signal wires of input/output (white/yellow) are set wrong, or power supply or ground wire connection might be the cause of the problem.

2. If the meter stops at 170 to 180 km/h;
Please check the a wiring diagram for HONDA and setup the SLD sky blue wire. (Check the table below)
* Please contact the shop where you purchased product or HKS dealers for more specific information.

(Refer to wiring diagram for these HONDA automobiles.)