So I'm doing this from my phone please excuse me if there's misspelled or lack of grammar.but I built my 2.2 yesterday loaded ms extras an put my zeal board in. started the car vroom running good. Here's the thing the car runs good but as soon as the tach gets under 1900 it just dips down to like 1k but my aftermarket tach still reads 1600 its a half bridge. But what would cause my tach to be off like that. Then if I rev it it seems to jump up to match the aftermarket. The aftermarket is off the leading stock dash off trailing

 

this is more clear this is what i posted on msextra

ok so this is what is going on. i put the zeal board in on my 2.2 i did the main stuff for 12v 5v an grounds to where it told me to ground them. for my vr2out pin 11 on cpu vr1 to pin 6 on u4 like in the msextra on rotary ignition vr2 to x14 pin 31 on db37 n ground to ground on the daughter board vr1 i have ran to unbanded end of d5 pin 24 on db37 ground back to the daughter board.

but heres the problem i have a aftermarket tach that runs off the leading tach an the trailing is the stock dash tach. but this is whats going on i start the car an it starts up fine. but as soon as the trailing tach(stock dash) goes below 1900 it just drops down to 1000 well the other tach is still reading the right rpm 1800. i have a very large port(half bridge) in the motor so it idles at 1700 warm. but it seems to loose signal if it goes below 1900 an just dropsan sits at 1000. kinda like if you take a aftermarket tach an put it on 8 cylinder insted of 4. i really hope this makes sense. please if anyone knows whats going on please let me know

 

Settings? msq?

 

ill save it an post it also today i got on it at about 5500 it just pegged to 8k idk whats going on whats happening. i need to make a log now that i have a laptop that will work i can get you one