The "no longer available" stimulator looks like one designed by (I think) Bob Ward? He was on thirdgen last I knew. If my memory's any good he had an old Malibu with twin blowers from a junkyard. He said he built that after looking at my test bench and deciding there was no way he wanted something so big and clumsy.
At the time, I thought mine was pretty organized. I used an ignition module from a small cap dizzy to drive a small LED so I had visual confirmation that the RPM generator was working. I picked up a GM test tool from a swap meet which outputs various frequency A/C signals for testing DRAC, instrument clusters, &etc. For most of what I was doing I found a fixed RPM input was satisfactory. I've also seen people use cable driven magnetic VSS connected to an igniton module as an rpm input. I used pots for sensors and put LED's on several of the outputs and on the REF and EST lines. Having trouble finding pictures but then again, I haven't had it out for at least 5 years. Here's the DIS system I set up for testing:
disrig2.JPG
It's an old PC fan with notches and a crank sensor connected to an actual DIS module. A dial back light was useful in measuring delivered timing to confirm chip settings. A PC power supply for the bench worked well for most testing but the DIS module with coils attached required more current so I had an automotive "jump pack" attached along with the power supply.
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