Hi again. This time I am posting in the right area. (this was from a post in General Classifieds)
To recap... I have a (new to me) RF99 VD (Pinto) with a Pi system 2 dash - the RPM box was not connected. With help from ApexSpeed members, I got the RPM to read using the HT connection (I got NOTHING using the LT). So yeah, progress.
I reads, but there must be a huge amount of noise, because the display is pretty jumpy and flips to redline and more then back. I adjusted the sensitivity - I turned it until it read nothing, then adusted it up until it was the most stable. But it is still not great. I don't know how I could rely on it.
For the HT connection, I simply ran a wire about 8 inches long or so and wrapped it about 5/6 times around the coil wire. I tried moving the RPM box closer to the coil wire and I tried moving it farther away. I even tried wrapping the RPM box and lead wire in foil and grounding that to the chassis (as a sheild). Still not a very stable RPM display. I tried keeping the RPM box away from the coil and other ignition cables. I even tried disconnecting the MSD.
What am I missing / doing wrong? For as expensive as the Pi System is, you'd think it would work well and be simple to do.
- Rob