how to hook up rpm meter on vin M 3100??

[gboogie99]

anybody know where the hookup for this is?

[bszopi]

Do you mean a tach?

White wire, pin C IIRC, on the ICM. Do a search for installing tach(ometer) and you'll find all the info you need.

[Guest]

Do you mean a tach?

White wire, pin C IIRC, on the ICM. Do a search for installing tach(ometer) and you'll find all the info you need.

Or purple/white at ICM.

[gboogie99]

so there is no actual sensor on the engine for this right? I am going off what someone told me on this.

ok, so all i gotta do is run the wiring to the icm and thats it?

[Syn]

so there is no actual sensor on the engine for this right? I am going off what someone told me on this.

ok, so all i gotta do is run the wiring to the icm and thats it?

you could hook it up to one of the wires on the coil packs and get half a reading. then they got some $80 or so adapter you can buy to just hook it up to the coils and get a full reading.

just go to the ecm

[bszopi]

What are you talking about half a reading?!?! And why would you need an adapter?



As you can see, Pin C (white wire) out of the ICM is for the tach signal. Just like I said at the top.

[Juglenaut]

The ECM does the computation from pin C it will actually only pulse 3 times a revolution there fore half the cycle. If a gauge was set up to read 3 pulse per revolution then it will read actual rpm, the ecm doubles this to create resolution.

If you have a multimeter with a Hz setting or frequency counter you can measure the frequency and divide that by 3 to get rpm.

Pin C would be the same as hooking a wire upto the negative side of cylinder all three coils before the switch as shown in the picture.

[gboogie99]

sounds good, thanks