So I have been doing a bunch of research and cannot find anything,
I have a 90 civic dx 5 speed manual and I recently did a mpfi conversion
but with a y8 head. So on the igniter, there is a empty spot on the y8 dizzy
that the tach has to connect to. So I manually wired the wire to the igniter
and ran it back to the car i de-pinned number 12 pin from the cluster.
that is marking for the tachometer and i did not get any reading one thing i did notice was the rpm
stays on 800-900 and does not move. I made sure the speedometer was the
same type of model (NS) and it was for the same year as well (90-91).

Not quite sure what i should do in order to trouble shoot it. any opinions?

 

The Y8 dizzy... so you're not using a TD02U? You shouldn't have to run a new wire regardless, there is a tach signal wire present in the original harness.

It might be helpful to list what harness/ECU/distributor you're using and what else, besides the Y8 head, you swapped in.

 

I am using the obd0 harness from the DX,
I have it connected to a jumper and
its converted to obd1 running p28 ecu.

engine is d15b2 with y8 head
chipped ecu and converted to mpfi

I was reading something about that but since i did the
conversion to y8 dizzy wouldnt i have to connect
the cable to the igniter.. lol im confused

 

Before I go much further, because you haven't specified... does the car run? Do you have any CELs?

You mean like this thread? https://honda-tech.com/forums/tech-m...1-ecu-2538296/ "Take the the cap and rotor off the distributor, you should have access to the igniter, there will be one free terminal on it, simply connect a wire here and connect the other end to the extra blue wire in the engine harness." So start by pulling whatever CCA primary wire you ran and use the existing wiring Honda gave you.

 

Wow nice i think i might try this.

If you take the distributor cap, rotor and cover off you will see a spare male terminal on the ignitor (next to the rotor shaft), simply run a wire from that spare terminal to the blue deadend plug with the black weather cover over it on the driverside strut tower by the hood prop and BAM!! The tach will work.

and yes my car is %100 functional and no check engine lights.

 

No. From that same post:
You don't have a 1999 civic. The tach signal wire is in the harness - I've already said that. The obd0 2-pin distributor plug has a blue wire. The reason you don't already have the connection on the distributor itself is literally explained in the 2nd post in that thread:

 

I don't have the the obd0 dizzy tho im running the y8 dizzy. im not running the TD02U.
on the y8 dizzy there is no blue wire but i said i wanted to try that because its saying i dont have to run the wire all the way in the vehicle and i can just tap in to the existing one right that is connected to the tower not the one connected to the dizzy lol

 

The blue tach wire should be attached to the circled ICM terminal.