Here's the breakdown, i had connected the VEMS's tach output straight to the tach, the car ran for a few months and do keep in mind that i barely drive it, then all of the sudden the signal started getting weak and the tach needle dropped dead never to come up again.
Sent the Unit to Jason at VEMS US and he fixed the output, got an MSD tach adaptor, forgot the number but it was powered, had ground and a "signal in" and "signal out". Hooked it up and it ran ok for a couple of weeks or months, then same thing, needle starts acting funny, eventually dropping and never getting up again.
I got this inline gadget from Kevin Black, switched the tach output to pin 34 out of the 36 pin plug and nothing, can't tell you what the gadget has in there so can't really tell. I eventually cut that gadget out because it's not working in this setup.
I reached out to Jason at VEMSUSA again and sent me another gizmo that resembles the old MSD adaptor that i had, powered, ground, "signal in" and "signal out" to tach. I hooked it up and nothing, swap another 3 tachs and none work.
Took the car to my friend's house and used his oscilloscope, he told me that the pin 34 was putting out a "dirty" signal and wasn't good or strong. I then went to the software and swapped Tach outputs from 34 back to pin 4, test the output and then said that the signal coming out of "Low Current output o (0.2A) Grounding, EC36 Pin 4 was good but the signal out of the gadget wasnt.
Is there anything i can look for? Do i need to change any configuration in the software? Seems like the Tach output is working, no?
Thanks in advance and i know that i can swap a newer style cluster in there but I want to use the old cluster.