Modifying the wiring on a Sprint to use Tach with Spiyda

[tvacc]

Hi all,
A few questions about how to rewire the tach on my 72 Sprint to use the spiyda.com/tachometer electronics conversion.
I believe I know how this all goes but I wanted to check with you all.

I had to go for the conversion as we now have electronic ignition and the tach does not work with it.
I believe in the stock configuration, there is a wire that goes from the ignition "hot" to the tach, then through the tack and back out to the coil.

So what I think I have to do is put those two wires together so they no longer go through the tach. That gives me power to the coil to start and run the car.

Then run another wire from the tach to the coil to pick up the signal for the tach to operate. I think I run that wire to the negative on the coil, correct?

If I have this wrong, let me know. I dont want to blow the spyida electronics.

Thank again guys and girls.

Tony V

[mbell]

That is inline with my memory of fitting it.

The real fun is calibrating it. I didn't find the calibrate of the car very accurate and so had to do it on the car. it is tricky adjusting the screw on rear of tacho with it wired in.

[tvacc]

I could barely get the tach out . I imagine it will be tough getting the brackets on the threaded parts and then putting on the ground and the nuts. I don't know how you would get to the adjustment screw with the tach in place.

[tonyabacus]

I seem to remember that the correct wiring diagram was on the Spiyda website, try there

[mbell]

I don't know how you would get to the adjustment screw with the tach in place.

I didn't, I removed it from it's home but left it wired up. Access to the adjustment screw was still very tricky.

[pharriso]

I believe in the stock configuration, there is a wire that goes from the ignition "hot" to the tach, then through the tack and back out to the coil.

So what I think I have to do is put those two wires together so they no longer go through the tach. That gives me power to the coil to start and run the car.

Then run another wire from the tach to the coil to pick up the signal for the tach to operate. I think I run that wire to the negative on the coil, correct?

That is correct, see page 4 of the Spiyda instruction sheet that I have e-mailed you.

[tvacc]

All set on this modification. I had Jeff K, a fellow LOONY (and Elan owner that is on this list) do the modification on the tach for me. Seems to work fine on just s quick startup. I am now trying to figure out why the high beam indicator does not work. Switching the steering wheel to a red one of now to see how I like it.

I repaired a 100lb dual oil pressure/coolant temp using the trick of buying a cheap bulb type unit and cooling the ether down with salt/ice and soldering on the new bulb and switched it out with my 60lb unit as my oil pump is high pressure.

Dont know how much more I will get to drive the Sprint this year as it is already getting cold here in Buffalo NY. Probably going to wait till next spring to really get the car out on the roads.