1990 Chevy k1500... I have my instrument cluster out due to some annoying speedo problem and a bad bulb. Local Chevy dealer tells me theydon't do repairs on site and send the parts out to AC Delco, understandable. They recommended I go straight through AC Delco, and a local search finds me no local shops that repair instrument clusters, meaning I'd end up sending it out as well. I am hoping to open it up myself and replace the bulb and look for any obvious problems with the speedo gauge. I have a static-control wrist strap, but have one simple question... how do I ground my workplace? I'd be working on my Craftsmen workbench... the strap comes with an alligator clip that needs to clipped to a grounded surface. FYI the speedo problem: randomly, and mainly at low speeds, the speedo will drop off to 0. The engine does react to this, as it feels like the throttle was let off just a tad. If I leave it be after a few seconds the Check Engine light lights up, no blinking, just a constant light. A sharp smack on the dash will bring the speedo back and the Engine light goes away. Thanks for any info..