A Cleaned up and Shrunk-down Version of the 1962-1964 Corvair Monza Spyder/Spyder Tachometer Schematic

Here's the original after cleanup.

My Version of the Schematic in a More Legible and Modern Style With Recommended Parts Substitutions:

Thanks to Pete Faulkner and Tony Underwood for the help with circuit analysis and substitution suggestions.

Here's the reversed-palette version (white background) suitable for printing.

The 1965-1966 Corsa tach schematic is basically identical to the earlier one. The meter movement and choice of transistor seem to be the major differences. I did get some component numbers from study of the Corsa tach, these are included:

• Note that examination of the 1549970 circuit package shows a month and year of construction. This could be handy for deciding just what year-model your tach was made for. In this particular case, the tach was from a 1966 dash, and the package had a build date of 7-65.
• I haven't a clue about who made the transistor, or about its original properties. Our substitute should work OK. If anybody has some old databooks and can get a real name for the manufacturer and some curves, it'd be appreciated. I have reproduced the logo as it is on the package pretty accurately.

Here's the reversed-palette version (white background) of the Corsa tach suitable for printing.

This is the results of my first round of Corsa tach testing.

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