How do I open the fuel cap on a 2007 Harley Davidson 1200 sportster?

SOURCE: spark plug

The proper air gap is .032 to .036 depending on spark plug brand.

SOURCE: oil drain plug

Follow the hose that goes to the frame from the oil tank. Loosen the clamp and pull.

SOURCE: spark plug

The proper air gap is .032 to .036 depending on spark plug brand.

SOURCE: 2003 Harley Davidson Sportster 1200 Custom Tachometer kit

The only idea that i can come up with is that you dont have a good ground..or the guage was bad when you bought it..i hope this..Keith

SOURCE: My Harley Davidson Sportster 1200 cuts out during exceleration

The volt reg could be getting over volts,the charging system may need to be tested to determine whats going out.The voltage output from the stator goes up with more rpms,when the voltage regulator gets too much it dumps it into the grounding side of your electrical system(somethimes the ground wire will get smoking hot)This dump of power could also kill the rest of the system.Make sure your carb is clean (remove trash from inside the jet and filter) just to be sure its not just dirty fuel system.