Plea for help from the enlightened....

[tim-d]

Hi all - apologies for the invasion from the mini forum - but am building up a project mini and have been given a tachometer from a midget - one small problem however I have have no idea how to connect this up, the loom in my mini has no obvious provision for an indendepent tacho) - the tacho come from I believe a 1275 midget, is negative earth and carries the serial RVI 2430/01. To the rear there are three connections a male spade, a male bullet and a female bullet shrouded in rubber casing (as well as the bulb holder that I've worked out for myself!) I'd be most grateful for any guidance - as the obvious bulb holder applies to the integral ignition light- i'd guess one of the three terminals relates to internal lighting?????
Many thanks
Tim