Not sure how that post fits into this thread to be honest :)
Well I was hoping for your advice back in August. However, from your last post when you say that this needs a skilled shop to do the calibration, this was the only one I could find.
Are there still type I boards available, preferably with software conversion from miles to km ODO-counting? Thanks Marc (DE)
interest in knowing that the circuit boards you created some many years ago are still working or if they have been finalized. If so, we are interest in current cost and availability
The two boards work quite well, i don't plan any design changes, but since i don't have time supporting and building then nowadays unfortunately i will publish them as open source open hardware projects in the very near future.
We are a Automotive Restoration Company/ speedometer shop. West Valley Instruments. We do a lot of repairs and have been looking for solutions for those Ferrari's. Are you selling the boards? at what cost?
Been trying to sort out my speedo for a while now. I have a 1976 308 GTB Vetroresina and it is a RHD UK model. Car is great but speedo has never worked since I have owned it. Sent the head in to Moma and they confirmed it had problems but fixed it and sent me a video of it working. Put it in the car and nothing. Replaced the transducer twice with no success. Checked the two wires between the transducer and the speedo and they have continuity. Confirmed 12 volts at the transducer with the key on. Gave up, paid Ferrari of Houston crazy money to look at it and they said it was a bad alternator -- replaced that with a $2500 alternator -- no change. Four months later they charged me $6500 (included a crush washer for my leaking oil pressure SU and replaced a boot on the CV joint) but clearly they don't know what the problem is and, as I later learned, the dealer was calling local shops here in Houston asking how to fix it. Frankly, I knew that I was in trouble when the service manager did not know how to open the door on the 308. Never saw this before but I noticed yesterday that if forget to pull the choke (its a carb car with a manual choke) and I crank on the car for a while the speedometer needle starts moving up to about 80 mph as I crank. If I stopped cranking it returns back to the stop. It did this a couple of times until the car started and once running the needle went back to zero. At least I know the needle moves. Still looking for ideas.
If your wheels are standing still, the speedo must not move. This rather looks like an electrical problem from my point of view. You should find someone with a scope and a wave generator and the knowledge how to work with these. This should bring some answers. The very short version: follow the black/red&green lines from the sensor at the gearbox to the speedo. You can dismount the sensor to turn it manually. Check it, using a scope as described at (alhbln's) site. The signals should reach your speedo at the same colored wires. Using a wave generator you can compose similar waveforms to test your speedo.
