tach pickup off damper bolts *help!*

sltlytwkd

sltlytwkd

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I just installed a autometer diesel tach on my p24v. I made a bracket for the tach pickup to read of the 4 damper bolts. The problem I'm having is that the ARP damper bolts have a hole/dimple in the center of the bolt head which I believe is making the tach read 2x actual rpm... (thinking there's 8 bolts instead of 4) My question is, is there any way I can cheat it without getting different damper bolts?? Anyone else ever have this issue? Thanks in advance!
 
I machined 4 slots into the dampener and use that as the pickup. So it picks up around the edge of the balancer instead of the bolts
 
bigstacks95 said:
I machined 4 slots into the dampener and use that as the pickup. So it picks up around the edge of the balancer instead of the bolts
Click to expand...

It's a fluidamper, that won't harm it at all right? It already has 2 slots on it, I wish there was an option on the tach.
 
I would offset the pickoff so its in a larger diameter picking up the bolts on the outer edge of the head and not over the dimple.
 
McCalley08 said:
I would offset the pickoff so its in a larger diameter picking up the bolts on the outer edge of the head and not over the dimple.
Click to expand...

Yea I thought about that too. Maybe I'll just try slotting the holes to move it around a bit, would be the easiest to try anyways.
 
I was only able to get mine smooth and accurate by welding four small tabs on the outside diameter of the balancer. I tried the recess style first and was jumpy and seemed to read high.

Smooth as factory with the raised tabs, again on a much larger diameter than trying to signal off the mounting bolts.
 
jasonc said:
I was only able to get mine smooth and accurate by welding four small tabs on the outside diameter of the balancer. I tried the recess style first and was jumpy and seemed to read high.

Smooth as factory with the raised tabs, again on a much larger diameter than trying to signal off the mounting bolts.
Click to expand...

What did use for tabs? Like key stock? It's safe to weld on the damper without being out another $400? Lol
 
sltlytwkd said:
It's a fluidamper, that won't harm it at all right? It already has 2 slots on it, I wish there was an option on the tach.
Click to expand...

Yeah mines a Fluidamper as well. I machined four 1 inch wide grooves spaced evenly around the edge. Fluidamper says thats fine just dont go deeper than 0.200"
 
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