Tach with EDIS

[trond]

Anyone out there with a quick reply on how to hook up the 80SC tach to EDIS ignition ?

I managed to connect the ignition easy enough but how to get the tach working remains unclear.


Grateful for any advice

Rgds

[benzyne]

there is a signal wire off of EDIS that connects to the tach lead and drives the tach without any problem. I'll look into it after work for details.

[benzyne]

I found this on the web ( from here Megasquirt MSEXTRA and MS3EFI support forum • View topic - Dual EDIS 6 wiring ):

pin 1 = PIP (raw signal to MS)
pin 2 = IDM (tach signal)
pin 3 = SPOUT (modified spark angle from MS)
pin 4 = Ignition Ground
pin 5 = Crank Sensor -
pin 6 = Crank Sensor +
pin 7 = Shield Ground
pin 8 = Power
pin 9 = Ground
pin 10 = coil A
pin 11 = coil C
pin 12 = coil B

[quaz]

There should be a purple wire with a black stripe you connect to PIN 2 on the EDIS which may vary in color depending on what car the EDIS harness came from. Look on the back of your tach and on the bottom there will be a positive, negative and the tach signal wire. Mine was purple, but I think it is the same for the SC. Find that wire in the harness coming into the engine compartment and splice that into PIN 2. Simple as that.......

[trond]

Thanks. Just didn't know whether the EDIS tach would drive the SC tacho. I've seen several posts concerning this.

Rgds

[quaz]

I have an SC tach in my 71 with EDIS and it works great.