Got the diodes, made circuit board up. Testing on car tomoz.

Any luck with getting your circuit going? I still waiting on Jaycar to get zeners in stock

I spoke with my sparky mate and we both come up with;

Coil -ve -------> 100K resistor ------> 5v Zener diode ---------> to PCM

will be testing once i get the materials, using a VS PCM (16176424) with 4L60e standalone.

Another option be an Arduino board?

I could use a hall effect pickup which will ensure 5v continous power via a regular 12v to 5v.

Then ill machine a magentic pickup and attach it to the crank pulley.

Could then use this for multiple engine applications.

Cheers mate,
Yes forgot to mention using a jaycar 12v to 5v converter which should be okay?

Regards Equada

Hi guys, bit further down the road now. Got the engine running with carb conversion - Holley 600 Elec choke - MSD coil - Bypass regulator and stand alone pump relay via oil pressure - Proflow HEI distributor On PCM i hook up - TPS - CTS - VSS - 4L60e plugs Now need to figure what pinout is tach in r...

Evening guys cheers for the input, The speedo setup I am using is a vl speedo cable into a cableX to keep the original cluster. I also hate the 4l60e because of this. After much reading over the posts i will put back on the EFI manifold and TB and run the $11P VP104 base tune and go from there. Chee...

Cheers guys,
So i can just tune the memcal for curves when adjusting carb jets and their corresponding shift points.
What will happen if i don have the ignition modules hooked up as well as dizzy?

Cheers Delcowizzid,
By leaving everything else connected i would run a t-piece for IAC and MAP.
My assumption is that the EFI curves would wreak havoc for carb tuning?

Cheers for the replies,
Its a carby fed 304 with 4l60e in a VL.

My scope of the query is to see if it can be done just for a cruising car.