Again, with a mind toward clearer understanding.
750B - I have reservations about labeling this diagram as 750B as it is for a very early Sprint with a mechanically activated starter and single horn.
In my mind, a 750B Sprint utilizes a solenoid for starting and requires three wires at the starter motor.
You used #14 for the engine to chassis ground strap
and again for electric horn.
(Yes - on very early Sprints there was one horn)
#17 Electromagnetic change-over switch for trafficators - this was copied from an original wiring diagram and is a mis-labeled component.
It is a relay which is activated by the steering wheel mounted ring/button for flashing the headlights.
There remains some serious modification required to get your wiring diagram to agree with the actual connections on a VEGLIA Tri-gauge.
I will address this in a separate message.
#22 - re-position with more space between it and the RIGHT tail light.
Reduce the size of IPRA heater for more space between it and black wire going to #17.
Possibly relocate to lower right area on diagram to better indicate position in right front wing.
Numbers 20,31,32 could be a different color for better identity as gauges housings and not wiring components.
#20 - might be better identified as Tri-gauge with meters or indicators for water & oil temp and petrol level.
#31 Speedometer with dynamo/generator light (not identified).
#32 Revolution counter with oil (pressure) gauge.
Your use of the RED STAR is very effective.
It should be used to indicate the metal housing of the gauges must be grounded.
The battery cable size could be indicated.
Last edited by GTD; 02-24-2016 at 08:53 AM.