Hello all,
Just wanted to see if anyone has successfully used the megasquirt tacho output to run the oem tacho on a tacho that was originally driven by the coil.
My car is originally an L-jetronic system (m20b23), so the tacho is driven off the negative side of the coil. I'm not exactly sure what signal this is. is it just grounding the cluster tacho output every spark event?
my understanding is the tacho output of the megasquirt is a 5v pulsed signal.
I see reference to people using a relay to convert this signal. Not a normal clickly clicky relay i hope?
Is there any reason i cant just put a transistor circuit on the megasquirt output and pull the tacho input to ground?
for reference, im running ms2 extra, wasted spark on 6 x LS1 coils. distributor is still in place (to fill the hole) but not connected to anything. Everything is run off the MS2. Everything runs great, but having no tacho on the dash is a little annoying.
Just wanted to see if anyone has successfully used the megasquirt tacho output to run the oem tacho on a tacho that was originally driven by the coil.
My car is originally an L-jetronic system (m20b23), so the tacho is driven off the negative side of the coil. I'm not exactly sure what signal this is. is it just grounding the cluster tacho output every spark event?
my understanding is the tacho output of the megasquirt is a 5v pulsed signal.
I see reference to people using a relay to convert this signal. Not a normal clickly clicky relay i hope?
Is there any reason i cant just put a transistor circuit on the megasquirt output and pull the tacho input to ground?
for reference, im running ms2 extra, wasted spark on 6 x LS1 coils. distributor is still in place (to fill the hole) but not connected to anything. Everything is run off the MS2. Everything runs great, but having no tacho on the dash is a little annoying.
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