Hi all,
Earlier this year I fitted an accuspark ignition module to my distributor and the car runs very well as a result. I have recently bought a SAAS tacho for the car and having trouble getting it to read properly. I am hoping someone here may have a solution for the issue I a can't solve.
Steps I have taken to try get it working correctly,
1. Installed, wired as per wiring instructions, AUX power, Batt constant power, earth, light switch power, green wire neg side coil signal to tacho. (Result tacho reads off the dial)
2. Instructions said if needle reading bounces around try installing a resistor 10K ohm 1/4 inline for the green signal (neg coil side signal to tacho). Tried it, did not help.
3. I noticed that when I hold each end of open wire and become the resistor the tacho sort of works, at least at idle. When the rev come up uncomfortable tingling runs through my fingers. Also when I pinch the wires tightly the resistance seems to drop and the tacho reads too high again.
4. I Tried supplying the power to the electronic ignition module from a different location away from the aux power to the coil to ensure no interfering signal was interrupting the signal, didn't seem to help much.
5. Checked the coil to make sure resistance was measuring correctly on both windings and all checked out correct. Was a little higher across terminals (3.2ohms) as higher performance than std coil.
I really cannot figure this out? All other functions on the Tacho are working correctly, it is set to 4cyl.
This is the tacho I have purchased
https://www.shopsaas.com/saas-tachometer-0-9k-shiftlite-3-1-2-in-dash-black-muscle-sg31642Tacho install instructions here
https://www.shopsaas.com/assets/files/install/MuscleInDashTachFitting.pdf