What size hex wrench for the oil pres. switch?

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pecsok

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I'm in the process of intalling VDO gauges to Leela the Wundercoupe, and while preparing to swap in the VDO oil pressure sender on the head I noticed the original switch has a much larger hex size than the 17mm VDO sender. Anybody know off hand what size it is?
Pics to come, pending how horrible a job I do..........
 
re:

Right. Thanks, Malc. I have up to a 22mm, (Well, I have a 32mm monster for the water pump) and it was still touch small, so off to Sears to increase my spanner collection!
 
Ahhh Sears tool department.... (drool as per Homer Simpson)
On a more serious note:
measure the oil pressure switch across the flats, that way you will get the correct size! a set of calipers, even a set of compasses will work!
malc
 
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