Save yourself $60 - make your own MSD 8920

[jettaflair]

Just take this schematic:

http://www.msextra.com/manuals...o.GIF

and put it inside a gutted relay:

87 to MSD tacho out / megasquirt tach out, 30 to ground, 85 to red/black tacho wire, 86 to switched 12v positive / positive coil lead.

Unfortunately, I'm getting static from the radio (even when it's playing a CD!) and I don't know how to fix it - I'm no electrician. All the connections were hot glued so they wouldn't rattle and touch. The tach works perfectly, however.

Modified by jettaflair at 5:14 PM 5-7-2007


Modified by jettaflair at 5:14 PM 5-7-2007

[g60manny]

but where do you get it

[jettaflair]

make it

[antichristonwheels]

what does it do?

[need_a_VR6]

Quote, originally posted by antichristonwheels »

what does it do?

Allows you to run a square wave tach output into a tach made for a spiking coil signal type output.

[Ultraflux3]

Bringing it back up. Has anyone successfully made this?

I can't seem to find out what the 2H5551 is it looks like a diode in the schematic, but I can't find any diode with that number.

I would rather spend $5 than $60-$80.

[need_a_VR6]

It's a transistor and a common 2N2222A works fine. You will want to gut the relay contacts to get rid of the buzzing.