Does anyone know if the signal at the Test Connector under the hood is digital? There is a shift indicator I want to install on my car, but it needs a digital signal. Its made for S2000's, but it can be used on any car as long as you have a digital signal to tap into to provide the engine speed. Thanks!

 

It is my understanding that you need to connect directly to the BLUE wire on the distributor that carries the Tach signal. Ther is an issue with the level of the signal at other locations. Then again why did Honda put a test connect elsewhere-it is not direct to the distributor I suspect, but connect to something. Tkae a regular tach and try it on the Test Connector-if it works then you are dealing with an Analog not digital signal. A digital signal will be a series of pulses.

 

i installed a pivot tach to the test wire a few years ago and the reading wasnt as good.. the needle would bounce around sometimes and even bounce enough to trigger the shift light... but the connection was good but it must have gone by another wire or something to interfere with the signal

 

Thanks for the replies. I dont have another tach around, but the guy who sells these said that if it doesnt work, I can return it. Ill try the test connector first to see if its digital.

 

We do alot of remote starts here where i work, and you have to tag into the tach to tell when the car has started correctly. To test to make sure the wire is the tach wire (we usually tag off of an injector), you hook a multi-meter up and check for an AC signal that changes with the revvs (of course). but being an AC signal, it's not going to be digital, but based of off voltage. So my answer to you is going to be no, the honda tach's aren't digital. Maybe the S2000 uses a different setup, but as far as I'm aware the prelude's aren't

 

just grab a whole motor off of nippon-motors.com for around $1200 and then you have the pistons, rods, cams, etc!

 

ok this "dumb terminal" here at work really is dumb! lol that post was to another board

 

i can tell you 100% that the integra has a digital signal on its B series engine and p72 (GSR) ECU's

When i installed my alarm, it was a whole lot easier to get the tach signal from inside the car from behind the dash. Its the blue wire on the 16 (or maybe its 18) pin connector that goes to the guage cluster. The integra tachs are digital.