...the tach in my car has something like that, before I got obsessed with this myself I sent the tach to PA speedometer to 'just have them restored' and it came back with a board hot-glued in like this...
The Dino circuit is simple (as are other '555 tach circuits), the surprising thing is that (with the billions of Veglia tachs) that the beautiful circuit board isn't immediately available on Ebay...Even, not a universal board. But I suppose one reason is that most people aren't going to have a function generator around to set the input frequency and calibrate needle/trim pot.... But making the circuit itself with a universal PCB could be simple...
The original Veglia circuit is not complicated either, just a couple transistors--but for me trying to test it (here in my Townhouse in Taiwan....) the issue was getting the 'trigger' to work--and trying to build an inductive amplifier (to take the frequency generator) should have been simple but failed me. So instead I took the Stepper Motor challenge. https://pantera.infopop.cc/top...93#19905352128593293
But another idea is to buy a cheap 2" 8krpm universal tach, make sure its triggering--then gut it and use the PCB or even the whole movement. Or (assuming the question is just the trigger), try that tach amplifier for $30...Lee
(oh, and in case the idea of transplanting a whole movement into the Veglia can is interesting, 2 things; (1) re-use the Veglia plastic bracket. (2) be patient beyond patient in fitting the Veglia needle onto the replacement shaft...the replacement motor is almost certainly bigger diameter, which then means either micro-surgery to drill out the female end on the needle and if break the 1mm or so drill bit into the needle, the only donor is another DeT gauge...)
