Dr E-
Weber brand Throttle Position Sensor p/n 99902.660 $93.34
Still awaiting the electrical cable connector to arrive from Pierce Manifolds. This fits all Weber DCOE types and the Dellorto. Installation takes about two minutes flat. I bought the anti-clockwise version which fits on the #1 cylinder end. The clockwise direction version is available too but I don't have a part number for that one.
Still investigating buying and installing a rpm sensor to mount onto the Elan's driveshaft which can output a 0-5v signal to one of the recording channels of the AFM. Going to have to invent my own sensor system to indicate the gear selection on the Hewland Mk5 on the 41.
Keep in mind the general tuning limitation of the AFM. Since it has only one sensor it measures the averaged values from four separate cylinders. If one cylinder or throat of a carb is seriously out of kilter from the rest it can be useless as a diagnostic tool. You'll then need something like an array of thermocouples with an EGT meter to have single cylinder diagnostic capability.
Don't think I've left out an necessary details so others can't replicate the process. If I have just ask. Just don't wait to long though cause I'm at that age my brain is full all the time and there's no more room.
Regards,
Keith
p.s Picked up my rollbar bits today! Yeah!