I've got an issue with my tach in the car again. Tach disappears under decel and coasting but under load its always there. I will see it during some coasting but most often it drops off, same with idle. What do I have to check other than the physical wiring from the ms led lead to the trailing coil ?

 

check the trailing ignition timing... again ... if the trailing timing is over 20 degrees at any point, you'll lose trailing, and won't get it back until you're at 15 degrees.

 

Right again, thanks Ken. I was able to get everything corrected last night, including my split and my advance table and was making 12 psi with no detonation and fairly crisp throttle response. I've got a couple lean spots while under vacume but nothing serious. I am hoping to get on the dyno next week to get some numbers, I expect its going to be between 375 - 425 at the wheels but right now its hard to tell with the sotp dyno but when boost hits full around 5k its like star wars warp speed its a beautiful thing.