Yup, tonight I put a new battery in, cleaned all the connections and installed the alternator and it fired right up after a long dormate winter. All I need to do now is fix the speedo gear and get the new exhaust put on (and the 4.56's in the front). First... I have the 87 K5 with 35's and 4.56's. Rolling through town following people my speedo says 65-75MPH (driving through town 35max usually with traffic, speedo is way off). So I need to know what gear I'm looking for to recalibrate the speedo gear. I have the number of a place here in Indy that can get them but I need to know what tooth (I think factory is 28tooth? right? And I need to move to a 31 or 32 tooth? Is that right?) Second... My little Blazer is a 2000 ZR2 S10 Blazer and I'm having some starting issues with it. http://coloradok5.com/forums/showthread.php?p=1530882#post1530882 Started small, checked connectors, fuses, spark. Everything looked ok. Went back out that night, truck fired up! Drove it around a couple days then it stopped again. Next day, no spark swapped out the cap and rotor, had spark wouldn't start. Tapped the valve on the fuel rail, banged on the gas tank and it started! Drove it around a few days and it stops again. Still not hearing the fuel pump kick on and off and the fact that releasing pressure ont he lined helped it start we thought weak or bad fuel pump. Swapped out the Fuel pump and fuel filter (tossed in the K&N air filter I had in the garage), truck fires up and drives around great, tons of power! Next morning go to get the battery for the big blazer and it won't start! WTF! Check spark it looks weak, heard the pickup module can cut in and out so we pull it out and replace it, put everying back together, check for spark, looks good, but still won't start! Only things left I can think of are the MAP/MAF sensor and the computer. Anyone have any other ideas, ways to test, I'm not use to the new FI setups.