Okay the below information I had found in another thread. However I have a couple questions am not a electrical guru.

Red why can't i plug this to 12v power or ignition male prong in dash fuse panel? not A25?
Black why can't i ground it to rest of gauge grounds to car? not A26?

Now the Analog 1 and 2 has me lil confused. I have hondata s300 v2. Obd1 p28. Which wire do I need to hook up into pin and which pin out? Yellow or brown? I have both stock o2 and MTX wideband. I am not sure which is the best method and am confused on closed loop and open loop. Any help in lamnents terms would be great.




MTX Gauge Wiring Install:
Yellow (Analog 1 Wideband 0-5V) = Connect to B6, D10, D14 (Remove necessary capacitors if needed)
Brown (Analog 2 Narrowband 0-1V) = Connect to D14
Black (Ground/Logical Ground) = Connect to A26
White (Cluster Guage/Headlight Power) = Connect to the Dimmer Switch
Red (12V Power/Ignition Power) = Connect to A25

 

It is better to connect that black wire to A25 because its a better ground location then bolting it to a piece of metal inside the passenger compartment.

Also I believe the white wire is not suppose to be hooked up to a dimmer switch. I think it has to be hooked up to the same wire that powers one of your headlights.

The yellow wire is an Analog Signal Wire.

Meaning it will put out a voltage between 0V and 5V depending on what Air Fuel Ratio that the sensor reads. This is the wire that you want to feed into your ecu for datalogging. The ECU will take in this 0-5V signal and calculate an Air Fuel Ratio like (14.7). I would solder this wire into the D10 pin which I believe is the ELD pin or Electronic Load Detecting Pin. I would use this pin instead of the D14 Pin because D14 pin can only receive a 0~3.3V while the D10 pin can receive the 0-5V without modification.

When you open the Hondata software I believe you have to tell the software that the D10 pin is going to be used for your AFR signal so that it knows where to look.

Hope this helps