Low Tachometer Reading

[33Coupe]

OK. Here is what is inside.
I have two free red leads. The blue lead is still in an intact loop.

Can you describe again how to connect these? Do I connect all the read and blue together? I don't understand your 'green' wire comment - I don't see any likely green wires.

Should I strip the blue wire and connect both red leads to the blue - all in one connection? Is that what you mean?

Thanks

[33Coupe]

picture attached

[msdtech27]

Originally Posted by 33Coupe

OK. Here is what is inside.
I have two free red leads. The blue lead is still in an intact loop.

Can you describe again how to connect these? Do I connect all the read and blue together? I don't understand your 'green' wire comment - I don't see any likely green wires.

Should I strip the blue wire and connect both red leads to the blue - all in one connection? Is that what you mean?

Thanks

all you need to do is connect the 2 red ends together and the 2 blue ends together, they DO NOT hook up to each other; red to red, blue to blue.

[33Coupe]

Reconnecting the red loop did not fix the low tach reading. Apparently there is some other issue. I ordered a new 6AL digital box. Hopefully, this will cure the problem.

Thanks for the help.

[slwryde]

I have been reading your thread as I have an issue like yours.
My tach is not 2000 rpm off but it is reading 500rpm low. Did you ever
find the real problem or just end up buying the new digital 6?

[79TA]

I'm having the same problem on my 455 Pontiac. Hits rev limiter at 3500 with a 5000 plug in it. I pulled the side cover and I see one red loop the is cut and a blue loop that is connected. Should I connect the red loop?

[79TA]

Well I connected the red loop and it works great. The tach hits 4900-5100 for the rev limiter. That's close enough for me. I guess I answered my question. Just had to connect the red wires back together. I guess someone had it on a V6. When I got it it was hooked up to a 318. But maybe that's why he sold it cause it wasn't working right....