Retarded info my bad. Note, the Zener Diode must be fitted backwards, so the strip on the diode is the opposite end to the stripe on the main board! Originally Posted by hellothere. Scott, which selection should I try? Dash tach works great The following shows a simplified block diagram of the Megasquirt system.
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This component is part of the kit tacch good suppliers b Ensure C30 is fitted. I do not have my laptop with my, but I think ‘X2’ is the fans which is another storyand I think the rest may be unused. Tach input external connection. Why I was not previously able to figure out that ‘tacho output pin’ has something to do with the tach is beyond me. Originally Posted by hellothere. Find More Posts by Joe Perez.
I did not build the tach output circuit for him and I’ve never had the for the circuit with a standalone MS before.
I have a mrgasquirt, and my tach does not work in my dash either. So please, no more responses about a wire in the wrong spot or the circuit built incorrectly There is a plug that goes into the ignitor and it has 4 wires on the plug.
I did jump the 2 points with a resistor I left that part out on my post. Note tch older directions suggested using modifications on the opto-isolator input for high-frequency use on toothed wheel install. Find More Posts by Braineack. The following shows a simplified block diagram of the Megasquirt system.
Megasquirt (V board) – Tach input
There are also a few “special” systems in use from the eighties that combine a sensor input with an ignition driver output in one module.
Tavh part of this manual may be reproduced or changed without written permission from James Murray, Ken Culver.
MS installed, No more dashboard tach. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.
Buffon needs to jump his diagnostics box as he’s confirmed 4 fours wires in his coil connectors. This sets them up for most VR sensors. With these two modules, the Megasquirt does not know or care how many teeth are actually on the wheel, so do not use the “toothed wheel” setting. Possible aftermarket arrangement for a hall sensor with flying magnets in trigger wheel. Megasquirt sees a tach signal, as the car runs. I used to build the pull up resistor into the harnesses, then found it was easier having people jump the signal and provided a resistor to use Typically engines run at around C so a minimum of C rating is required, C desired.
That’s what I thought, thanks for confirming.
MS installed, No more dashboard tach
This will often result in timing shift and is not recommended. You did build mine for my 94 standalone, and I did have to move a wire.
I also had to solder the MAP sensor to the main circuit board when I discovered measquirt it had been overlooked. I didn’t know there such hint as a It wasn’t a big deal nor was the map sensorthat’s why I never brought it up. I will try to make a run to radio shack sometime soon. I recently purchased a standalone MS setup from Braineack.
Note, the Zener Diode must be fitted backwards, so the strip on the diode is the opposite end to the stripe on the main board!
Originally Posted by Braineack. Find More Posts by buffon