How to calibrate Stock NA Tachometer for V6 Signal

[V6'er]

Parallel port, what's that?

From the port, all that's needed to interface the tach is a transistor and two resistors, plus the power supply of choice. For a 1MZ tach, you need 12VDC. For pretty much anything else that's driven by the coil/Igniter, you need at least 24VDC.

[xr4man]

Originally Posted by Gimpster

V6'er, what's the best way to generate multiple frequences on the bench to test? I wonder if something like the Megasquirt Stimulator could be used (since it generates RPM signals to test your Megasquirt with)?

that's exactly what i did to calibrate merkur tachs. i just pulled the tach signal schematics off the stimulator board and made a separate module. the stimulator circuit has built in pots for coarse and fine adjustments. works pretty good. i mounted an aftermarket tach to the side of my box so i could have it to calibrate the stock tach to.