well got my car running, obd1 gsr in a 92vx. only problem is that the stock tach doesn't read accurate. at idle is sits at 0, under light load reads close, but under heavy load reads high. i figure this since i have my vafc2 hooked up, and have it on rpm. anyone know what may be wrong?

 

anyone have this problem

 

mines not reading right after a b18c swap. it revs up to 8200 but only reads 7. iknow its revving right cuz i hit 120 in 4th. :-\ dont know if the problems are related or not...