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Had my backstay converted to MkII type, so have the original backstay and need to get it out of the garage. In good condition.

Does anyone know offhand what the thread size is on the shutoff plug for the oil siphon hose on the bottom of the pan on a M25XP? It looks to be about 1/2 inch. Thanks.

So the MX25 wont fire up after much cranking. I checked the fuel filter and the fuel pump and both appear to be working. I thought I'd check the glow plug switch for power, and I am getting twelve volts across the two back ends even when the button is not pushed in. Is this right? It would seem that I should only get voltage across the terminals when the button is pushed in. Am I missing something?

I have a problem with my fuel gauge on my 1987 34. The gauge works because when I short across the sender post and the ground post the gauge reads over full. So I finally got in to look at the tank and here's what I found. The wire from the center pole on the fuel tank sender goes to the hot lead on the fuel pump. The a second wire goes from one of the mounting screws to a ground bracket on the tank and then on to the sender pole on the fuel gauge. Somehow this doesn't seem correct. Is this the way the wiring is supposed to go?

UPDATE- So I completely re-wired the sender and the tank. The sender now has a wire going directly to the sender post on the gauge. Also, the tank is now grounded, as is the sender. But the gauge still doesn't red anything. I checked the sender with a multi-meter and it reads 88 ohms, which correlates with what appears to be a little less that half a tank. I know all the grounds are good, because when I jump the tank ground post and the tank it reads 2 ohms, and when I put the ground on the sender post the gauge reads full (same wire). So what am I missing?