Analog tach for VW

[TiPi]

The one I had specified a fuse. The tach should already have a very high internal resistance.

doesn't protect the ignition from a short through the wire. The resistor at the P-lead connection is to safeguard aganist any short incl the wire.

 

[Dana]

doesn't protect the ignition from a short through the wire. The resistor at the P-lead connection is to safeguard aganist any short incl the wire.

If the fuse is up front at the magneto (as mine was), it protects everything downstream just as a resistor would.

The unfused P-lead going back to the magneto switch is just as susceptible to a short.

 

[TiPi]

that fuse is a "make you feel good" device! the current is very low and extremely intermittent (very brief at the ignition time), so for a fuse to work it would have to be extremely fast and rated very close to the current in the P-lead.
Unfortunately, you can't protect the P-lead to the kill switch or you won't be able to switch off the ignition. Double-insulated wiring and good quality switch & connections are all you can do. It is more likely that the original P-lead fails in open circuit.

 

[PixiePilot]

Yes, in Colorado you won't see my 29 inches, normal asperation. Manifold pressure gage surely demonstrates density altitude pressure drop...about one inch per 1000 ft of climb. Thanks for the fuse info.

 

[n45bm]

Westach makes one that will fit but depending on your limit it might be in the “break the bank” area for you.

Here’s the one I think you would need *ouch*

2AT32 | Westach

Tachometer 3,500 RPM2 1/4" squarestd pt or mag ign2 imp. ( 4 cyl ) Light kit 186-12A2 sold separately Instructions

www.westach.com

Prices for this kind of stuff is sky rocketing! Shazam!

 

[Pops]

When I was building the SSSC, I ordered the 2AT32 Westach from AS. Recieved a 2 cycle 6K tack. Called and was told to ship it back and they would send the correct tach. The other one came in the mail before I got the first one shipped. They shipped me the same wrong tach the second time. Now I had 2 wrong tachs. This time I called AS and told then that I was shipping both wrong tachs back and canceled the order and bought a Tiny-Tach somewhere else.