Brand new  #9 Calibration resistor for all H1 6.5TD H1 HUMMERS 96+.

#1 thru #9 resistors adjust the fuel rate output your injection pump. The #9 is the largest value available. The OEM states a 6% increase in fuel delivery over a stock #5 at full throttle. (aftermarket scam #13 will trip an SES code) Unlike a gas engine, with diesel engines, the more fuel injected, the more hp produced. PROVEN effective by diesel enthusiasts everywhere. Changing the resistor is just like turning up the fuel on the older manual injection pump. You can actually retain your great mileage using this resistor if you drive normally. But, if you put your foot into it, you will see more power and reduced mileage. I personally run a #9 and average around 20 MPG with a K1500 p/u.

The calibration resistor location by design, stradles the PMD connector pins and is sandwiched in place between the harness and the PMD/FSD connector. (see 2nd photo for an installed view) Average value used stock is a #5, but diesel enthusiasts know that increasing to a #9 is a definate performance boost. Installation instructions included. PMD/FSD's and FSD Heat Syncs are also available.