UVCH?You can put a straight edge across the injectors to make sure they are at the same level. Make sure you get all the old copper washer tip gaskets out. The injectors should also "draw down" when they are torqued down (120 in-lbs!!!). On each 5-pin VC harness plug, the outermost pins (pins 1 & 5) are glowplugs, the center pin (pin 3) is common to 2 injectors, and the adjacent pins (pins 2 & 4) are for a single injector. Replace the UVCHs while your at it if you're not already doing it. Also replace any external connectors that have burned or melted pins (do one wire at a time, keeping the order the same as it was on the original. Cheers!