Russell kindly built one of these for me a while ago and I gave him the wrong info for my v8. I said it worked on 8 pulses but actually its only 4 so it read half the revs. I finally got around to calibrating it against my ECU reading and by adjusting the pot I could get it correctly reading throughout the range. I didn't change any resistors.
Back side of 260z tachometer. Where connect supply variabile voltage? Wires red and wires black?View attachment 30091
Only just seen this.
That looks like it will just work as it is the newer version that doesn’t use a coil based pickup.
Sent from my iPhone using Tapatalk
Hi Im interest for now, only make a work test for my RPM removed from car. What type of signal voltage connect at the wires to test the rpm ? use battery 1.5volt ? how tesat to check if work or not. thank you
This looks great! Do you know if Jon managed to get a tach that went to 10k? Even better, a Spinal Tap Tach that went to 11k for when you need that "extra push over the cliff" .
Hi Russell, my tach hasn't worked since it was converted from points to dizzy, forgive my ignorance but will this fix my issue, or is it just for ECU conversions?I still have a load of these boards left over if anyone needs their tach repairing or upgrading.
I have my original one that’s converted already and would like to swap it for a broken one that I can cut up guilt free.
Sent from my iPhone using Tapatalk
Hi Russel,I wired it back into the original input posts.
For the signal wire, I took the induction loop or whatever it’s called out and wired it straight into the post.
If you pull the signal from the coil you need a heavy duty drop down resistor. I don't know the voltage from the coil, but probably a 4W or 5W resistor. Otherwise you'll fry the circuit in your tacho!As this tacho thread has some good information I though I'd tag my question onto it. I have an early 260z with the current loop type tacho and a 280zx dizzy. The car is also totally rewired. The coil/tacho circuit is simple and just goes from coil fuse through tacho loop and to the + terminal of both dizzy and coil. Trouble it I cant get the tacho to work and I have no spares to test with. I do have several non current loop type with just the single input. So. my question is can I just take a wire from the - coil terminal to the tacho input. I have seen people mention it needs a 2.2kOhm resistor in series. Can anyone confirm this?
John, that's my setup on both my 240 and early 260. No problem.As this tacho thread has some good information I though I'd tag my question onto it. I have an early 260z with the current loop type tacho and a 280zx dizzy. The car is also totally rewired. The coil/tacho circuit is simple and just goes from coil fuse through tacho loop and to the + terminal of both dizzy and coil. Trouble it I cant get the tacho to work and I have no spares to test with. I do have several non current loop type with just the single input. So. my question is can I just take a wire from the - coil terminal to the tacho input. I have seen people mention it needs a 2.2kOhm resistor in series. Can anyone confirm this?
Do the early tachos have a resistor built into them?John, that's my setup on both my 240 side early 260. No problem.
I've got a working spare @johnymd, I could post it down to you and pick it up later when I collect the lift.As this tacho thread has some good information I though I'd tag my question onto it. I have an early 260z with the current loop type tacho and a 280zx dizzy. The car is also totally rewired. The coil/tacho circuit is simple and just goes from coil fuse through tacho loop and to the + terminal of both dizzy and coil. Trouble it I cant get the tacho to work and I have no spares to test with. I do have several non current loop type with just the single input. So. my question is can I just take a wire from the - coil terminal to the tacho input. I have seen people mention it needs a 2.2kOhm resistor in series. Can anyone confirm this?