MS3x installed, tach doesn't work.
 

Any idea what I can do to troubleshoot my factory tach gauge now that it's not working since installing the MS3x?

Also, if anyone wants to give me a base fuel map/tune for 15 PSI on a GT2554R with 460cc injectors, that'd be awesome :giggle:

Is it getting CAS signal?

Yes, been driving it around all night without the tach.

I need to figure out how to AutoTune this thing.

Did you ever figure this tach issue out? As soon as I installed my MS2 PNP my tach stopped working. The car runs fine and the megasquirt reads the correct rpms.

basic settings > tach out > on | tacho | normal.

This, assuming you also hooked up the correct wire in the harness.

the brain doesnt put wires in the wrong spot. never happens.

The spot happened to be in the wrong place at the wrong time?

I feel more retarded than normal. My car hasn't had a tach since I installed the new megasquirt 2 PNP from DIYautotune. About 10 miles of driving after I installed it the car is now running on 2 cylinders. It appears that one coil is not firing. The car is using their base tune, aside from adding some timing and tuning AFR's.

I was under the impression the stock tachometer should work right out of the box with a PNP unit, is that incorrect? Do I need to physically wire the tach output on the megasquirt to the tachometer?

When I go to Tacho Output it is enabled and normal.

The base tune had the dwell settings at 3.0ms, when I contacted DIY for help they suggested I change it to 5.0ms. Would this have fried the coil? I changed it to 3.0ms now, but the coil still doesn't appear to be firing. I could just wire in my COPs, but I hate to install them if something is wrong and they're just going to get fried too.

you dont have ms3. start your own ms2 issue thread :)

I'm also struggling to find the correct wire into my cluster tach, I've seen the green blue wire mentioned as well at 1h. I'm not using the igniter cuircuit, since I'm cops, was figuring I could run tachometer out (ms3x) direct to my tachometer, but what wire ? Cluster and car is a 1990. Thanks for your help !

why not just wire your cops correctly?

I believe I did wire them correctly, but then again I'm a noob so I could have misinterpreted the directions. It's actually LS2 coils, not COPS - sorry - I ran a fused 12V Feed and Engine ground, then have the signal wires directly from the MS3X to each coil. I was under the impression Tacho Out on pin 26 could be wired directly to my 1990 tach input signal, am I mistaken ? I did confirm I have the Tacho pullup jumper on JP3 installed.

Thanks !

Braineack - any thoughts sir ?

not directly, no. gotta wire to the black/white wire, and then jump the yellow/blue wire in the engine harness that used to plug into the Ignitor.

OK, let me make sure I got this straight

For the Ignitor connector i do this

https://www.miataturbo.net/attachmen...ine=1408663718

And then I wire tacho out to the 2I main harness connector.

did this work for you?