Tachometers

[Banditlead]

How hard is it to install a Tachometer? I know I don't really need one, since my car has a C4, but I think it would be good to have on anyways. How hard are they to install, wire up? How do they install, and heres a good question... how do they work?
Thanks alot.

 

[LMan]

Not hard at all. There will be 4 wires: 2 to the coil, one for the instrument lighting, and a ground (IIRC, been a while since I installed a tach). It works by sensing the firing of the coil.

 

[crushnut]

Last time i tried to install a tach it went backwards Any ideas as to why?

 

[3spd on floor]

maybe your motor spins the wrong way

possibly the polarity was reversed on it, possibly caused by hooking the tach leads up to the wrong terminals? though i would have thought that it would just burn out if hooked up wrong. thats weird.

 

[Great68]

I only had 1 wire going to the negative terminal of the coil.

The other 3 wires were: Positive power, ground, and light switch.

Simple.