Location: Townsville, Queensland
Registered: September 2002
help with hooking up a Speco tacho onto a 4A-C power Tercel
Sun, 24 August 2003 03:40
Brought the tacho and hooked it up directly to the '-' point on the coil. Tacho moves but very eraticaly and does not show true RPM. Hooked it up through a spare coil resister to the '-' point on the coil to try and quiten it down a bit and it is exactly the same.
Any help? It is a 4A-C running points ignition. The stock tacho works but is mechanicaly busted. I have had the cluster out before, should I take it out and try hooking the pickp wire to one of the tacho points on tle back of the cluster.
Location: Townsville, Queensland
Registered: September 2002
Re: help with hooking up a Speco tacho onto a 4A-C power Tercel
Sun, 24 August 2003 11:31
took dash appart and had a look where the standard tacho gets its power from. It has a IG '+'(I guess for ignition), IG '-' and E. Hooked up three wires, ran them out of the dash and tried all there on the tacho. As expected the IG '-' does the same as if I connect it to the '-' side of the coil. Had a look at the back of the tacho and set it to 8 cylinder (even though it is a 4) and the tacho seems to display the correct RPM now but it still moves eratically around the point it is displaying. However when you go to set the shift light (by pressing a button you have control over the needle and can set the shift point) the needle moves fine, so it does not look like a mechanical fault.
Will see an auto lec about putting a capacitor in line to even out the reading a bit so it does not bounce around. Will do this before taking it back as it just might be dodgy power. Will trying hooking up a new resister (coil resister) to see if that is what is causing the problem. (but it must be something in the stock tacho that evens it out because I took the signal from it and it still was dodgy).
Sun, 24 August 2003 03:40
