Ghost
08-24-2012, 09:19 AM
Curious if anyone knows how I can re-wire a tach so it works with an 8 cylinder motor, if that is even possible.
The context is that before, I had twin inline 6 motors in the boat. Now I have a single v-8. Until I do a whole new dash project some ways down the road, I'm trying to make use of gauges I already have. For the most part I have pairs of gauges from the twins, but will be happy to have one from each pair hooked up and functional.
I know that many tachs are adjustable to work with 4, 6, or 8 cylinder motors. I don't know if mine are, but I suspect they might be. They are old 70's vintage Kiekhaefer Mercury tachs. Here are pics of the front and back.
7273972740
In the second pic, I've labeled 4 terminals A-D. Two are connected (to purple wires and a gray wire). Two are not connected. I'm wondering if anyone is familiar with these, and knows whether some re-arrangement of wiring will/might run the tach properly for a V-8. (I tried a couple things already that didn't *seem* right, and figured it might be worth asking now instead of blindly dowsing for accurate rpm.)
All thoughts/speculation/vague-distant-recollection welcome. Thanks in advance,
Mike
The context is that before, I had twin inline 6 motors in the boat. Now I have a single v-8. Until I do a whole new dash project some ways down the road, I'm trying to make use of gauges I already have. For the most part I have pairs of gauges from the twins, but will be happy to have one from each pair hooked up and functional.
I know that many tachs are adjustable to work with 4, 6, or 8 cylinder motors. I don't know if mine are, but I suspect they might be. They are old 70's vintage Kiekhaefer Mercury tachs. Here are pics of the front and back.
7273972740
In the second pic, I've labeled 4 terminals A-D. Two are connected (to purple wires and a gray wire). Two are not connected. I'm wondering if anyone is familiar with these, and knows whether some re-arrangement of wiring will/might run the tach properly for a V-8. (I tried a couple things already that didn't *seem* right, and figured it might be worth asking now instead of blindly dowsing for accurate rpm.)
All thoughts/speculation/vague-distant-recollection welcome. Thanks in advance,
Mike