aftermarket tachometer install questions
 

please dont come on here flaming me for wanting to finish up the install on this. my factory one broke from the previous owner and i had this one laying around. i have everything wired in to be installed(gauge in place, power/ground wired, shift light.) i just need to know where to wire the last green wire to. alot of places have said to the trailing ignition coil......i have no idea which one this is, ive only been playing with rx7's now for about 2 months, my first one was a non running 12a sa22c, this one is an 86 base model. and help would be greatly appreciated. and once again, please dont come in here talking **** on what im trying to do, its my car....but i am new to the roatry thing....pics/advice would be great. thanks

if you find the brake booster/master cylinder, there is a coil near that. if you find the wire harness that the coil plugs into the car with there is a bullet connector that's just loose.

this loose bullet connector is the factory test connector, so it outputs a tach signal, so plug into that, its the easiest way.

are you talking about the lil random green connector plug thats just kind of hanging there? i dont have access to the car for another few hours, but ill definetly look into it and get a better idea of what plug youre talking about. the only reason i asked about the green plug is because ive been told that green plug is a factory test connector

i'm not sure what color it is, but there is a bullet connector that's a test connector right by the brake booster/trailing coil

i appreciate it. ill check it out as soon as i get a chance

ok. so i connected the tach to said bullet connector. and it seems that the tach is only getting half the correct rpm reading. i tried unplugging the connector next to where the bullet connector was, whatever it was was giving the factory tach power. i tried unplugging that thinking if i only had power going to the aftermarket tach it might receive full power, now neither of them work though(but somehow my factory "shift up" light still works)and i plugged that connector back up and my main tach is now receiving correct rpms, but my aftermarket one is only getting walf, and thats pretty constant through the rpm range(idle@1100<main>/idle@500~550<aftermarket>)

hi there. just need to know where to wire the green wire of an aftermarket tach. please help.