So far I have hit 3600 with stock gov spring. Fuels to maybee 3050 to 3150 there abouts.

 

I installed the ISSPRO 2.25 tach that goes to 4k and the kit the make to into the stock wiring harness. It didn't read after I wired it in exactly how the directions read. So I called Piers and they told me to wire it using the wire without the filter on it. (It says in the directions its for a 3.5 in tach). After taking thier advice it worked perfectly. Now I need to install the gov spring I ordered.