Removed the bucket, it has a 4,6,8 cyl selector. The front face has "Made in the USA" on the bottom and no other markings. Any idea who the manufacturer is? Since it only has 2 wires im assuming it requires a sending unit? Especially since one of the wires is a light.
Uh I am seeing 4 wires not two. Rwed to switched power, green to the tach supply either the coil or in your case the Tach terminal on your hei. That leaves two wores to deal with for the light and the ground, black would be my choice for ground but I am not seeing black so whatever wire supplies the light is not the ground the other is.
Just picked one of these tach's up at a swap meet. Anybody know if it will work with a Petronix ignition? Would the wiring still be the same as described above?
You'd wire it to the negative side of the coil. Try it, see what happens. Make sure you ground the tach body to the car.
tried hooking this up to my hot rod with an accurate tach and it seems to respond very slowly and doesn't seem to get up to the correct rpm. Seems to read correct at idle but moves very slow. Any ideas as to what might be wrong?
I have a tach that looks just like yours. Made in USA, on it. No other markings, and only 2 wires. I wired one to the "tach" position on the HEI. The other came from the light bulb. I mounted on metal dash so assumed the tach housing was grounded there. Mine works like that.
It sounds like I'm having trouble with the tach due to my Pertronix Ignition - apparantly the electronic ignition doens't have enough juice to power the tach?? Does anybody know if one of the MSD tach amps can be used to boost the signal??