Yeah I know, I wrote those for 99-00 swapping a VvT in and using 01-05 ignition.

That was why I asked the question regarding the caps but I didn't install one in the harness (NB1) but will put one in the toolbox just in case or modify the other (NB2) harness

Many exist. Here is one style:
http://www.summitracing.com/parts/msd-8913

Touche, I'll add to the OP.

Just FYI the stock 90-97 spark plug wires will fit into the VVT VC if you trim the rubber a little bit. I used a razor blade and slowly removed rubber off the top of the boot until they fit down fine. I have had no problems with them like that.

So where should the NA harness ECU ground point go?

The bracket for the 94-97 ECU grounds can be transferred over to the 01+ block. IIRC, the OEM 90-93 ECU grounds attach to the back of the intake manifold, and those can just be attached to the 99+ manifold.

Where do you typically route the extra wires through the firewall to the ECU?

I put mine through the holes from the A/C delete.

Alrightly. So Oregonmon has his VVT swapped '90 with a MS3, and GreddyGalant has his MSM swapped '92 now with a MS2PNP.

They're both screaming for tachs.

I've Ctrl-f'd every post with the word "tach" in it, and all they seem to say is "wire it to the tach".

Is this at the cluster? One of the ignitor wires I capped? Please spoon feed wire color and location. Thanks.

search noob

Following the instructions in the op connects the tachometer in the cluster to the tach output wire (2I). If you've connected it that way, and you have a tach driver circuit, and it still doesn't work, you probably need a pullup resistor.

Yup I did that, so just connect the tach output pin on the MS3 to 2I?

Ok someone explain this?

Is this the 1k ohm resistor between -IG and GND in the diagnostic connector?

Tried that (both ways) and it didn't work. Black/white and yellow/blue are soldered together, tacho pin is enabled in TS, and still no tach. WTF.

Pullup resistors are (by definition) between a signal and a voltage. +B to -IG and your tach will work.

Well, I thought I had it, but nope. 1k ohm resistor between -IG and B+ now and still nothing. Resistor flipped both ways, multiple resistors tried. Any other clues?

Put a direct wire between 2I and your tach input on the instrument cluster. I did it this way and it works (on my 97 1.6 Euro NA there was no wire from 2I to the igniter)

Wire your tach signal from the cluster to pin 10 on the DB37.

On every 90-93 USDM car, if you loop the wires as directed in the OP, you get a wire that is connected from 2I (black/white) to the cluster (yellow/blue) without routing a redundant wire to do the same job. Just FYI. Adding a wire to do that job is unnecessary and clutters things up.

ECU settings, then. That I can't help with.

Post tunes? Tach out set correctly? Pretty sure the ms3x card needs a jumper, but if its an mslabs ecu I'm not sure how Rev has that set up. Just throwing out ideas. According to this tach out is turned off by default.

Thanks for putting this together.

I'm in the process of selling my entire powertrain (engine, trans, MS3, etc etc) and turbo setup to someone with a NA (think its a 95).

I'm going to install a LFX.

Being that we can use all of those working bits (I'm keeping my radiator/ fans, throttle cable, steering) how much of this will be necessary to perform the swap? I imagine I will be forced to use the GM harness and ECU so I could even swap over the harness.

We are thinking we'll simply take everything out of my car and swap it over to his.