Honda S2000 How to Get the Engine Revolution Signal

It is necessary to acquire the revolution signal when installing a tachometer, etc., but we will introduce a method to acquire it without cutting the ECU wiring. According to the Defi connection guide, the TA signal can be taken out from the “engine revolution detection coupler”. This time it is AP2 type.

So, this is the S2000 engine revolution detection coupler.

Describes where the coupler is located. Looking at the lower right (fender side) of the brake master, the vehicle harness passes from the bulkhead. There is a coupler with only one blue line coming out of it.

It’s hard to find because it’s covered with a rubber cap and fixed to the harness with vinyl tape, but you’ll find it if you look closely. It is located between the master back and the ABS unit.

The good thing about the engine revolution detection coupler is that it is not used at all because it is for maintenance, and even if the wire breaks for some reason, nothing is connected, so there is no problem with running.

For connection, it is easy to insert it directly into the coupler and extend it. If you use the male terminal of the flat terminal, you can insert it as it is. I think it’s a good idea to use a heat-shrinkable tube for insulation.

For waterproofing, make a hole in the rubber cap of the coupler, pass the wiring through it, and then cover it. Of course, I think it is even better to take further waterproof measures with vinyl tape.

Since the area around the coupler is very narrow, it is recommended to remove the stay of the throttle wire to make space.

All you have to do is pull the extended wiring into the car and connect it.

It’s just an extension of the existing wiring, so I think it’s the easiest and least risky. I haven’t confirmed it, but I think it’s probably in the same place on AP1.

If you are thinking of installing a tachometer, please try it.