On Bench ECMs

[Bruce Plecan]

For doing this ecm testing on bench I need to come up with a
0-4,000 pulse/min 50% PWM for the speedo, 0-6000 rpm
V-8 tach signal, and something like a O2 swing...
Would anyone have something like that hanging around/whip
up a 555 schematic for me?.   Sure be quicker than me
trying to figure it out.  Can use a audio transformer for Pick
up coil input right?..
Cheers  Bruce  Wonder how many little black dodaads will
                          loose their smoke over this