Well first of all.. I've been trying to fix this problem lately.. Hopefully you all can help me. I have a 93 civic DX with a B15D7 engine, When i bought the car, I purchased an EX cluster, because it had a tachometer on it. I noticed that when I would start the car, the tachs idle rpm was on 0k ?? Thats odd..... I thought.. So i'de give it gas, and it would fly up to around 5k, then let off the gas and it would go to 0 again. While driving though, sometimes it would ride around 1K.. some times it would go around 2K .. It would normally look like its going the right rmps at mid-range though 3-5K .. So I thought something was wrong with the tach... so I've been wanting a racing tach for a while, so a CC member sold me a 5 inch R1 Racing Tach with shift light, and I plugged it all in right White to Dome light, red to ignition, black to ground, and green i ran to the distributer coil, which is the correct spot for it. I started my car up, it lit up, and i was like wow.. it seems to be working.. It was just under 1k like it should be. no jumping or dropping or anything. I gave it gas, and .. HUH? it would only go to 4K max.. I know i went to about 6700K too.. which is a bit of an over-rev i think? But my question is finally here... I am wondering if there is any way to get a true reading off of the coil without getting MSD or anything, because thats too pricey for me right now. Please help me find the fix for this!!! Thanks..