I made the blanks for these many years ago because people asked me to. http://tinyurl.com/3bl2pz there are more detailed shots if you scroll forward. On a Commando the reading is normally taken from the rocker feed. IMO to do it right you need to drill out the intake rocker shafts with an 1/8 drill killing off the plastic cross feed tube this leaves an available outlet for the gage. I never kitted it out because most people who replied couldn't even handle the plumbing let alone pulling the rocker shafts and drilling them. I will sell you a unpolished blank if you like PM me.
norbsa 1960 TR6 1963 Super Rocket 1965 650 Star 1966 441 1968 Thunderbolt 1969 Twinkle 250 1972 Fastback 1974 Roadster 1970 S.S Way too many BSA's not named http://decentcycles.com
Here is an example of a oil pressure gauge I did twenty some years ago. (The bike is not a pretty as norbsa's because it's been neglected in the back of my garage for many years -- something I'm in the process of correcting.)
You will obviously get all kind of replys on this one....I do have a story to add. Last year I was riding my 72 750 commando with "combat" cases....(73 is the same). I had a "spirited" ride out to Gloucester (90-100mph). Then on the return I was on a slow cruise through a town on the return route. I heard a "clunk", then the oil pressure guage went to ZERO. :rolleyes: I of course pulled the clutch, killed the engine, and coasted to the side of the road. Rescue and recovery ensued VIA pickup truck. Upon teardown I found the oil pump drive had broken off!!! Further investigation found a chard of metal in the gears of the oil pump which had locked up the pump and of course the crank just spit the oil pump drive off like a chew of tobacco. Well I finally found the culprit.
dynodave BSA 3 1961-1963 Ducati 3 1992-2002 Norton many 1951-1975 87 Serv-Equip 100HP MC brake dynamometer,