I'm wanting to be able to read the RPM very acuratly and at a high refresh. OBD 2 is very slow from what I have seen or maybe the off the shelf devices tend to refresh slow and if thats the case What device will read it faster. Maybe there is someplace to read the RPM as fast as our gauges do....


Anyone have any ideas?

 

There are four electrical connections directly behind the gauge cluster.

As you are looking at the dash from the driver's seat, the second one from the left is a black connector with 20 pin positions (not all will have pins).

Pin 5 has a blue wire that is listed in the schematic as "Tachometer signal output."

I have no information on the signal that is on this wire. It may be a series of pulses corresponding to RPM.

I would be _very_ careful about hooking anything but a high impedance probe to this thing as its tightly associated with the CPU in the gauge unit, something you don't want to break.

We bear no responsibility for whatever trouble you get into, but we'd love to hear the story.

 

The RPM input on my traqmate records at 10Hz. I'm tapping into the same wire that modifry uses for his shift beeper. I don't know much about how it works, except that I set the number of cylinders and the analog/digital setting to 'digital' I suspect that means it's a pulse-frequency deal.

 

Using SC_Highlanders adviace, I'm getting some ones and zeros but I need to find out how to make something of them.

ideas welcome

 

We now have my cars RPM on the laptop but not in a very usable form... more tinkering to do........

 

Here are some ideas on what to make with ones and zeros:

01
10
10000
100000
000001
1010101010101
01010101010101

Well, too many to list. you get the idea.

 

0101010103100101.... damnit! I just cant get it right.