I recently installed an ems-pro on my 95 miata, however, I am having a lot of difficulty finding the proper tach signal to make the box function correctly. It seems there is quite few options for tach signals from what I've been reading, but I have found no concrete answers nor have any of the configurations that I have read about worked.

 

Do you mean an MS3-PRO? If so according to the manual here it should be pin 24 on the white connector. I believe you would hook that to a black/white wire in your harness depending on which type of 95 you have.

 

No I have an ems-pro. The black and white wire is 1f i believe. I tried it earlier with no luck. The pin out on the ems pro is a little different. I also have an early 95. 02/95

 

Tach is not ECU controlled in Miata 1990-early 1995. You can confirm early 95 by finding 4 wires to each ignition coil. If you have 3 wires, then you have a late build car.

Assuming early build, you may need to just install a 1k ohm 1/4 watt resistor between IG- and 12V in your under hood diagnostics connector.

 

im having trouble getting the car to start. the box is not getting a tach signal...do you know the dip switch positions for this setup

 

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Im getting power at the CAS but tuner studio is not seeing a tach signal

 

I misunderstood.

DIP switch run down is on page 3 of the installation manual, followed by detailed explanation of functions on the next 2 pages:
http://www.diyautotune.com/downloads..._guide_1_0.pdf

 

i looked through that page a couple times. i am still unclear of 1-2, 1-3, 1-4 and im not sure if i need to use 1-8. this is my first time using a cam and crank sensor for a standalone...on my vw setups i used cdi ignition setup with and msd using my hall effect sensor as a trigger.

current dip switch settings
1-1 down
1-2 down
1-3 down
1-4 up
1-5 up
1-7 down
1-8 down

2-1 down
2-2 down
2-3, 2-4, 2-5 up

 

Don't forget to ground the gray wire with the black stripe - the directions don't quite make it clear, but this needs to be grounded when using the opto in input.

 

.....life saver....thank you im going to try to start this car again shortly...should i be using the cam sensor input for wasted spark?

 

The cam sensor input on a Miata is mandatory with the stock CAS.

 

alright ill put it back on. The CAS only has 4 windows. How should i set this up. The settings here How to MegaSquirt your Mazda Miata dont seem to be working. I get an rpm signal briefly then it stops according to the tuner studio tach anyway.