Note this work cost the life of my homemake (vintage 1972) 12 tester. such a sacrifice!! good news is I get to make a new one. store bought, we don't need no stinkin store bought!!! of course I will have to buy a solder iron and a new light bulb. Maybe this time I will fix it to last longer than 30yrs. must have been shoddy workmanship, or the bragging I was doing about it being the first tool I made myself. the gods of fate were listening of course so 5 minutes later it broke. should have known better. sigh...glad to help you out chuck. just get the dimmer switch and you will be set.....unless the perches fall off. Have you made it by the carb dudes place yet for the throttle linkage thingy? Later gator, tatortot