i just picked up a sun tach for my 73 f100. It has no wires on it but i can see 4 pins. My question is anyone know which is what? I can see a three letters, a T, B and L the other is hidden. I Paid $5 for it, would be great if it works. Thanks for any info

 

Not sure what pins correspond to what wire - any more information that you can share?

 

Are the pins on the inside? Here is what I can show without tearing into it.

With the cylinder switch at 6 o'clock:

Green runs to about 5 o'clock
Red runs to about 12 or 1
Black and white side by side to about 11.

Green goes to coil
Red to keyed hot
White to dash lights
Black to ground


Hope this helps.

 

thanks for the help guys, i just got back from a buddy's house who has a uncle that told me what the pins are...
L-- light
G-- ground
B-- 12v switch
T-- neg coil.
hope this might help someone other than me....thanks again..

old guys rule...lol

 

Good luck with it. Post up some pictures once you have it installed.

BTW how did you know I was old?

 

On mine.....
12 oclock...neg coil
3 oclock.....fused power
6 oclock.....ground
9 oclock.....switched light