- Tue Jun 22, 2021 7:13 pm
#51294
[/quote]
You need to replicate the high voltage pulse that comes from the coil if you want to drive your original tachometer. The circuit shown on this page is the one I used, using the coil from a relay;
https://www.msextra.com/forums/viewtopi ... 01&t=69602
[/quote]
Thank you for explaining this. I had another thought as I was clicking through the link you provided. Currently I have an MSD 6A ignition box running off the stock amplifier. When I installed that, I used an MSD 8910 Tach Adapter.
https://www.holley.com/products/gauges_ ... parts/8910
The wiring diagram for the MSD looks similar to the diagram you referenced (attached). I'm guessing it is doing a similar thing to what the resistor and coil are doing. Seeing as I already own this and it's already in the car, I'd like to try it and see if it can be used to drive the tach. Is there a risk of hurting the speeduino by testing this? I don't want to burn anything up.
You need to replicate the high voltage pulse that comes from the coil if you want to drive your original tachometer. The circuit shown on this page is the one I used, using the coil from a relay;
https://www.msextra.com/forums/viewtopi ... 01&t=69602
[/quote]
Thank you for explaining this. I had another thought as I was clicking through the link you provided. Currently I have an MSD 6A ignition box running off the stock amplifier. When I installed that, I used an MSD 8910 Tach Adapter.
https://www.holley.com/products/gauges_ ... parts/8910
The wiring diagram for the MSD looks similar to the diagram you referenced (attached). I'm guessing it is doing a similar thing to what the resistor and coil are doing. Seeing as I already own this and it's already in the car, I'd like to try it and see if it can be used to drive the tach. Is there a risk of hurting the speeduino by testing this? I don't want to burn anything up.